Nulls elements

Which of the following values are available to define a null element in YAML ?
Correct
- ~
- null
The choices were
- false
- null
- ~
- -
Help

http://symfony.com/doc/current/components/yaml/yaml_format.html#nulls

~ null
Twig operator precedence

In Twig, which of the following operators has the highest precedence?
Correct
- | (filters)
The choices were
- <=>
- ==
- in
- | (filters)
- or
- and
Help

https://twig.symfony.com/doc/3.x/templates.html#expressions

| (filters)

Functions usage

Which expression can be applied to ??? in order to display the name of each people along with his name and age?

{% set people = [
    {firstname: "Bob", lastname: "Smith", age: 12},
    {firstname: "Alice", lastname: "Dupond", age: 13},
] %}
{{ ??? }} {# Must display "Bob Smith is 12 years old, Alice Dupond is 13 years old" #}

{{ people|map(p => "#{p.firstname} #{p.lastname} is #{p.age} years old")|join(', ') }}

{{ people|map(p => "#{p.firstname} #{p.lastname} is #{p.age} years old")|join(', ') }}

```
{{ people|split(', ') }}
```
Twig
None of those
```
{{ people|join(', ') }}
```
Twig

{{ people|map(p => "#{p.firstname} #{p.lastname} is #{p.age} years old")|join(', ') }}Twig

Escaping

Which syntax is valid to avoid escaping ?
Correct
- {{ hello|raw }}
The choices were
- {{ hello }}
- {{ hello|raw }}
- {{ hello|escape('no') }}
- {{ hello|no_escape }}
Help

https://twig.symfony.com/doc/1.x/filters/escape.html

{{ hello|raw }}
Get value

How to get the value of title set in a form?
Correct
- ```
{{ form.title.vars.value }}
```
  Twig
The choices were
- ```
{{ form.vars.title.value }}
```
  Twig
- ```
{{ form.title.vars.value }}
```
  Twig
- ```
{{ form.vars.title }}
```
  Twig
- ```
{{ form.title }}
```
  Twig
Help
- https://symfony.com/doc/3.0/reference/forms/twig_reference.html#form-variables-reference
{{ form.title.vars.value }}Twig
Evaluating Expressions in Twig

How can you print the value of the name property in a Twig template ?
```
class Foo
{
    private $name = 'bar';
    private array $data = ['name' => 'baz'];
    public function getName(): string
    {
        return $this->name;
    }
}
```
Correct
- {{ foo.getName() }}
- {{ foo.name }}
The choices were
- {{ foo.['name'] }}
- {% foo.['name'] %}
- {% foo.data.name %}
- {% foo.name %}
- {{ foo.data.name }}
- {{ foo.getName() }}
- {% foo.getName() %}
- {{ foo.name }}
Help
- https://twig.symfony.com/doc/3.x/templates.html
{{ foo.getName() }} {{ foo.name }}
Get current route

How to get the current route name from Twig?
Wrong
- {{ app.request.route }}
The choices were
- {{ app.request.attributes.get('route') }}
- {{ app.routing.route }}
- {{ app.request.attributes.get('_route') }}
- {{ app.request.attributes._routeName }}
- {{ app.request.attributes._route }}
- {{ app.request.route }}
Help
- http://symfony.com/doc/current/templating/app_variable.html
- http://symfony.com/doc/current/components/routing.html
Twig

Which of the following statements will display bar ?
Wrong
- {{ [] is not empty ? 'foo' : 'bar' }}
- {{ 0 ? 'foo' : 'bar' }}
- {{ 0 is not empty ? 'foo' : 'bar' }}
- {{ '' ? 'foo' : 'bar' }}
- {{ [] ? 'foo' : 'bar' }}
- {{ '' is not empty ? 'foo' : 'bar' }}
The choices were
- {{ '0' is not empty ? 'foo' : 'bar' }}
- {{ [] ? 'foo' : 'bar' }}
- {{ [] is not empty ? 'foo' : 'bar' }}
- {{ 0 ? 'foo' : 'bar' }}
- {{ '' ? 'foo' : 'bar' }}
- {{ 0 is not empty ? 'foo' : 'bar' }}
- {{ '' is not empty ? 'foo' : 'bar' }}
- {{ '0' ? 'foo' : 'bar' }}
Help
- https://twig.symfony.com/doc/1.x/tags/if.html
- https://github.com/twigphp/Twig/blob/1.x/src/Extension/CoreExtension.php (twig_test_empty)
Twig delimiters

What is true about twig delimiters ?
Correct
- {{ ... }} is used to output the result of an expression
- {% ... %} is used to execute statements such as for-loops
The choices were
- {% ... %} is used to output the result of an expression
- {% ... %} is used to execute statements such as for-loops
- {{ ... }} used to execute statements such as for-loops
- {{ ... }} is used to output the result of an expression
Help
- https://twig.symfony.com/doc/1.x/templates.html#synopsis
- The only exception to these rules is the include() function that can be called using both {{ }} and {% %} syntax.
{{ ... }} is used to output the result of an expression {% ... %} is used to execute statements such as for-loops

String concatenation

Which is a valid statement to concatenate two strings in Twig ?

```
{% set concatenated = 'foo'.'bar' %}
```
Twig

```
{% concatenated = 'foo'.'bar' %}
```
Twig
```
{% set concatenated = 'foo' ~ 'bar' %}
```
Twig
```
{% concatenated = 'foo' + 'bar' %}
```
Twig
```
{% concatenated = 'foo' ~ 'bar' %}
```
Twig
```
{% set concatenated = 'foo' + 'bar' %}
```
Twig
```
{% set concatenated = 'foo'.'bar' %}
```
Twig

https://twig.symfony.com/doc/3.x/templates.html

Checking if constants are defined

In a Twig template, how can you test that a given constant is defined by PHP? (Example, how can you check if VERSION constant is defined by Symfony\Component\HttpKernel\Kernel class?)

{% if constant('Symfony\\Component\\HttpKernel\\Kernel::VERSION') is defined %}
  ...
{% endif %}

{% if constant('Symfony\\Component\\HttpKernel\\Kernel::VERSION') ?? %}
  ...
{% endif %}

{% if constant('Symfony\\Component\\HttpKernel\\Kernel::VERSION') %}
  ...
{% endif %}

{% if defined('Symfony\\Component\\HttpKernel\\Kernel::VERSION') %}
  ...
{% endif %}

{% if constant('Symfony\\Component\\HttpKernel\\Kernel::VERSION') is defined %}
  ...
{% endif %}

{% if constant('VERSION', 'Symfony\\Component\\HttpKernel\\Kernel') %}
  ...
{% endif %}

The is defined support for the constant() function was added in Twig 1.28 (November 2016). See http://twig.symfony.com/doc/functions/constant.html

{% if constant('Symfony\\Component\\HttpKernel\\Kernel::VERSION') is defined %} ... {% endif %}Twig

String concatenation

Which is a valid statement to concatenate two strings in Twig ?

```
{% concatenated = 'foo'.'bar' %}
```
Twig

```
{% concatenated = 'foo' + 'bar' %}
```
Twig
```
{% set concatenated = 'foo' ~ 'bar' %}
```
Twig
```
{% concatenated = 'foo'.'bar' %}
```
Twig
```
{% set concatenated = 'foo'.'bar' %}
```
Twig
```
{% concatenated = 'foo' ~ 'bar' %}
```
Twig
```
{% set concatenated = 'foo' + 'bar' %}
```
Twig

https://twig.symfony.com/doc/3.x/templates.html

HttpClient

By filling the requirement to have libcurl>=7.36, in which cases HTTP/2 will be enabled ?
Correct
- you passed the value 2.0 to the option http_version when you created the client (factory HttpClient::create)
- You haven't passed a specific option to the factory but you're requesting an https url
The choices were
- You haven't passed a specific option to the factory but you're requesting an https url
- you passed the value true to the option http2 when you created the client (factory HttpClient::create)
- you passed the value 2.0 to the option http_version when you created the client (factory HttpClient::create)
Help
- https://symfony.com/doc/5.0/components/http_client.html
you passed the value 2.0 to the option http_version when you created the client (factory HttpClient::create) You haven't passed a specific option to the factory but you're requesting an https url

PHP Iteration

Consider the following code snippet :

<?php
function xrange($len) {
    $i = 0;
    while ($i < $len) {
        /* ??? */
        $i++;
    }
    return;
}
foreach (xrange(1000) as $i) {
    /* Do something ... */
}

What should replace /* ??? */ to make $i available to the foreach loop?

```
yield $i;
```

```
push $i;
```
```
new Iterator($i);
```
```
return $i;
```
```
yield $i;
```

http://php.net/generators

yield $i;PHP

Date Handling

What are the correct ways to parse the 1983-07-01 date into an DateTime object?
Wrong
- ```
Yaml::parse('1983-07-01', Yaml::DATETIME)
```
- ```
Yaml::parse('1983-07-01', 32)
```
The choices were
- ```
Yaml::parse('1983-07-01', true)
```
- ```
Yaml::parse('1983-07-01')
```
- ```
Yaml::parse('1983-07-01', 32)
```
- ```
Yaml::parse('1983-07-01', Yaml::DATETIME)
```
- ```
Yaml::parse('1983-07-01', false)
```
- ```
Yaml::parse('1983-07-01', Yaml::PARSE_DATETIME)
```
Help
- http://symfony.com/doc/3.1/components/yaml.html#date-handling
- https://github.com/symfony/symfony/blob/3.1/src/Symfony/Component/Yaml/Yaml.php
ways to parse the 1983-07-01 date into an DateTime object? Wrong Yaml::parse('1983-07-01', Yaml::DATETIME)PHP Yaml::parse('1983-07-01', 32)PHP
Redirect Response

Lets assume that our application is reachable through https://myapp.comand using a homepage located via a route called homepage.

Which of these are correct ways to create a redirection response in a controller that extends Symfony\Bundle\FrameworkBundle\Controller\AbstractController?
Wrong
- ```
$response = $this->redirectToRoute("homepage")
```
- ```
$response = $this->redirect($this->generateUrl("homepage"))
```
- ```
$response = $this->redirect("https://myapp.com/")
```
The choices were
- ```
$response = $this->redirect($this->generate("homepage"))
```
- ```
$response = new RedirectionResponse("/")
```
- ```
$response = new RedirectResponse("https://myapp.com/")
```
- ```
$response = $this->redirectToRoute("homepage")
```
- ```
$response = $this->redirect("https://myapp.com/")
```
- ```
$response = $this->redirect($this->generateUrl("homepage"))
```
Help
- https://symfony.com/doc/current/controller.html#redirecting
ways to create a redirection response in a controller that extends Symfony\Bundle\FrameworkBundle\Controller\AbstractController? Wrong $response = $this->redirectToRoute("homepage")PHP $response = $this->redirect($this->generateUrl("homepage"))PHP $response = $this->redirect("https://myapp.com/")PHP
Security

Which of these is the correct way to use the Security annotation to secure a Controller with the ROLE_ADMIN?
Correct
- @Security("is_granted('ROLE_ADMIN')")
The choices were
- @Security("ROLE_ADMIN")
- @Security("require('ROLE_ADMIN')")
- @Security("is_granted('ROLE_ADMIN')")
- @Security("must('ROLE_ADMIN')")
Help
- http://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/security.html
way to use the Security annotation to secure a Controller with the ROLE_ADMIN? Correct @Security("is_granted('ROLE_ADMIN')")
Ignoring Attributes

What is the correct way to ignore attributes?
Correct
- ```
$serializer->serialize($person, 'json', [
    AbstractNormalizer::IGNORED_ATTRIBUTES => ['age'],
]);
```
The choices were
- ```
$serializer->setIgnoredAttributes(['age']);
```
- ```
$serializer->ignoreAttributes(['age']);
```
- ```
$serializer->serialize($person, 'json', [
    AbstractNormalizer::IGNORED_ATTRIBUTES => ['age'],
]);
```
- ```
$normalizer->setIgnoredAttributes(['age']);
```
Help

https://symfony.com/doc/4.4/components/serializer.html#ignoring-attributes

way to ignore attributes? Correct $serializer->serialize($person, 'json', [ AbstractNormalizer::IGNORED_ATTRIBUTES => ['age'], ]);PHP
PHP constant

What is the correct way to display the value of a PHP constant?
Correct
- ```
{{ constant('Namespace\\Classname::CONSTANT_NAME') }}
```
  Twig
The choices were
- ```
{{ Namespace\\Classname::CONSTANT_NAME }}
```
  Twig
- ```
{{ Namespace\Classname::CONSTANT_NAME }}
```
  Twig
- ```
{{ constant('Namespace\Classname::CONSTANT_NAME') }}
```
  Twig
- ```
{{ constant('Namespace\\Classname::CONSTANT_NAME') }}
```
  Twig
Help
- http://twig.symfony.com/doc/functions/constant.html
way to display the value of a PHP constant? Correct {{ constant('Namespace\\Classname::CONSTANT_NAME') }}Twig

Handling Arrays

With the following code:

use Acme\Person;
$person1 = new Person();
$person1->setName('foo');
$person1->setAge(99);
$person1->setSportsman(false);
$person2 = new Person();
$person2->setName('bar');
$person2->setAge(33);
$person2->setSportsman(true);
$persons = array($person1, $person2);
$data = $serializer->serialize($persons, 'json');

what is the correct way to deserialize the $data into an $persons array of Acme\Person objects?

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
use Symfony\Component\Serializer\Serializer;
$serializer = new Serializer(
    array(new GetSetMethodNormalizer(), new ArrayDenormalizer()),
    array(new JsonEncoder())
);
$persons = array();
$persons = $serializer->deserialize($data, 'Acme\Person', 'json', $persons);

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
use Symfony\Component\Serializer\Serializer;
$serializer = new Serializer(
    array(new GetSetMethodNormalizer(), new ArrayDenormalizer()),
    array(new JsonEncoder())
);
$persons = $serializer->deserialize($data, 'Acme\Person[]', 'json');

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
use Symfony\Component\Serializer\Serializer;
$serializer = new Serializer(
    array(new GetSetMethodNormalizer(), new ArrayDenormalizer()),
    array(new JsonEncoder())
);
$persons = $serializer->deserialize($data, 'Acme\Person[]', 'json', 'array');

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
use Symfony\Component\Serializer\Serializer;
$serializer = new Serializer(
    array(new GetSetMethodNormalizer(), new ArrayDenormalizer()),
    array(new JsonEncoder())
);
$persons = array();
$persons = $serializer->deserialize($data, 'Acme\Person', 'json', $persons);

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer;
use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
use Symfony\Component\Serializer\Serializer;
$serializer = new Serializer(
    array(new GetSetMethodNormalizer(), new ArrayDenormalizer()),
    array(new JsonEncoder())
);
$persons = $serializer->deserialize($data, 'Acme\Person', 'json', true);

way to deserialize the $data into an $persons array of Acme\Person objects? Wrong use Symfony\Component\Serializer\Encoder\JsonEncoder; use Symfony\Component\Serializer\Normalizer\ArrayDenormalizer; use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer; use Symfony\Component\Serializer\Serializer; $serializer = new Serializer( array(new GetSetMethodNormalizer(), new ArrayDenormalizer()), array(new JsonEncoder()) ); $persons = array(); $persons = $serializer->deserialize($data, 'Acme\Person', 'json', $persons);PHP

Deserializing in an Existing Object

Which of the following is the correct way to deserialize $data formatted in xml into an existing Acme\Person object named $person?
Correct
- ```
$serializer->deserialize($data, 'Acme\Person', 'xml', array('object_to_populate' => $person));
```
The choices were
- ```
$serializer->deserialize($data, 'Acme\Person', 'xml', $person);
```
- ```
$serializer->deserialize($data, 'Acme\Person', 'xml', array('object_to_populate' => $person));
```
- ```
$serializer->deserialize($data, $person, 'xml');
```
- ```
$serializer->deserialize($data, $person, 'xml', true);
```
- ```
$serializer->deserialize($data, 'Acme\Person', 'xml', array('object' => $person));
```
Help
- http://symfony.com/doc/current/components/serializer.html#deserializing-in-an-existing-object
way to deserialize $data formatted in xml into an existing Acme\Person object named $person? Correct $serializer->deserialize($data, 'Acme\Person', 'xml', array('object_to_populate' => $person));PHP

Voters

What is the signature of the voteOnAttribute() method from Symfony\Component\Security\Core\Authorization\Voter\Voter abstract class?

voteOnAttribute(string $attribute, mixed $subject, TokenInterface $token)

voteOnAttribute(TokenInterface $token, mixed $subject, string $attribute)

voteOnAttribute(string $attribute, TokenInterface $token, mixed $subject)

voteOnAttribute(string $attribute, mixed $subject, TokenInterface $token)

voteOnAttribute(TokenInterface $token, string $attribute, mixed $subject)

https://github.com/symfony/symfony/blob/v6.0.0/src/Symfony/Component/Security/Core/Authorization/Voter/Voter.php

voteOnAttribute(string $attribute, mixed $subject, TokenInterface $token)PHP

Security Voters

What methods MUST be implemented in a custom voter extending Voter ?
Correct
- voteOnAttribute()
- supports()
The choices were
- supportsAccess()
- voteOnAttribute()
- vote()
- supportsAttribute()
- supports()
- supportsSubject()
- voteOnAccess()
Help
- https://symfony.com/doc/5.x/security/voters.html
voteOnAttribute() supports()
Dependency Injection Tags

What is the tag to register a service that initializes objects before validation?
Correct
- validator.initializer
The choices were
- validator.initializer
- validation_initializer
- validation.initializer
- validator_initializer
Help
- http://symfony.com/doc/current/reference/dic_tags.html#validator-initializer
validator.initializer
Dependency Injection Tags

What is the tag to register a custom validation constraint validator?
Correct
- validator.constraint_validator
The choices were
- validation.validator
- validator.constraint
- validation.constraint_validator
- validation.constraint
- validator.constraint_validator
- constraint_validator
- validator_constraint
Help
- http://symfony.com/doc/current/reference/dic_tags.html#validator-constraint-validator
validator.constraint_validator
Security

Which sentences are true about user checkers ?
Correct
- user checker methods throw an exception when requirements are not fulfilled
- user checkers must implement a checkPreAuth method
The choices were
- user checkers must implement a checkPreAuth method
- user checkers must implement a check method
- user checker methods throw an exception when requirements are not fulfilled
- user checker methods return false when requirements are not fulfilled
- user checkers must implement a preCheck method
- user checkers must implement a preAuth method
Help
- https://symfony.com/doc/2.8/security/user_checkers.html
user checker methods throw an exception when requirements are not fulfilled user checkers must implement a checkPreAuth method
Firewall Configuration

You can change where the login form redirects after a successful login using the various config options. In case no previous URL was stored in the session, you may wish to try using the HTTP_REFERER instead. Which security.yml parameter allows you to use the Referer HTTP header?
Correct
- ```
use_referer: true
```
  YAML
The choices were
- ```
referer: ~
```
  YAML
- ```
referer: true
```
  YAML
- ```
use_referer: true
```
  YAML
- ```
use_referer: ~
```
  YAML
Help

http://symfony.com/doc/current/security/form_login.html#using-the-referring-url

use_referer: trueYAML

Form Extension

How to add an extension MyForm to the Form component ?

use Symfony\Component\Form\Forms;
$formFactory = Forms::createFormFactoryBuilder()
    ->addExtension(new MyFormExtension())
    ->getFormFactory();

use Symfony\Component\Form\Forms;
$formFactory = Forms::createFormFactoryBuilder()
    ->addExtension('text', new MyFormExtension())
    ->getFormFactory();

use Symfony\Component\Form\Forms;
$formFactory = Forms::createFormFactoryBuilder()
    ->registerExtension(new MyFormExtension())
    ->getFormFactory();

use Symfony\Component\Form\Forms;
$formFactory = Forms::createFormFactoryBuilder()
    ->addExtension(new MyFormExtension())
    ->getFormFactory();

use Symfony\Component\Form\Forms;
$formFactory = Forms::createFormFactoryBuilder()
    ->add(new MyFormExtension())
    ->getFormFactory();

https://symfony.com/doc/2.8/components/form.html#request-handling

use Symfony\Component\Form\Forms; $formFactory = Forms::createFormFactoryBuilder() ->addExtension(new MyFormExtension()) ->getFormFactory();PHP

Config per env

How to register a service in a specific env in php ?

use Symfony\Component\DependencyInjection\Attribute\In;
#[in(env: 'dev')]
class SomeClass
{
    // ...
}
// you can apply more than one attribute to the same class:
#[in(env: 'dev')]
#[in(env: 'test')]
class AnotherClass
{
    // ...
}

use Symfony\Component\DependencyInjection\Attribute\When;
#[When(env: 'dev')]
class SomeClass
{
    // ...
}
// you can apply more than one attribute to the same class:
#[When(env: 'dev')]
#[When(env: 'test')]
class AnotherClass
{
    // ...
}


use Symfony\Component\DependencyInjection\Attribute\On;
#[on(env: 'dev')]
class SomeClass
{
    // ...
}
// you can apply more than one attribute to the same class:
#[on(env: 'dev')]
#[on(env: 'test')]
class AnotherClass
{
    // ...
}```

use Symfony\Component\DependencyInjection\Attribute\In;
#[in(env: 'dev')]
class SomeClass
{
    // ...
}
// you can apply more than one attribute to the same class:
#[in(env: 'dev')]
#[in(env: 'test')]
class AnotherClass
{
    // ...
}

it's not possible

https://symfony.com/blog/new-in-symfony-5-3-configure-multiple-environments-in-a-single-file

Serializing an Object

Which of the following is the correct usage for serializing the $person object into json?
Correct
- ```
$serializer->serialize($person, 'json');
```
The choices were
- ```
$serializer->serialize($person)->toJson();
```
- ```
$serializer->serialize($person, 'json');
```
- ```
$serializer->toJson($person);
```
- ```
$serializer->serialize('json', $person);
```
Help
- http://symfony.com/doc/current/components/serializer.html#serializing-an-object
usage for serializing the $person object into json? Correct $serializer->serialize($person, 'json');PHP
Dispatch

What is returned by $dispatcher->dispatch($event, OrderPlacedEvent::NAME) in the following code?
```
$event = new OrderPlacedEvent($order);
$dispatcher->dispatch($event, OrderPlacedEvent::NAME);
```
Wrong
- ```
true
```
The choices were
- ```
$event
```
- Nothing
- ```
true
```
- ```
$dispatcher
```
Help

https://github.com/symfony/event-dispatcher/blob/5.0/EventDispatcher.php
isEmpty

What is returned by the isEmpty method of Symfony\Component\HttpFoundation\Response?
Correct
- true if the response status code are 204 or 304
The choices were
- true if the response content is null
- true if there is a server error
- true if the response status code are 204 or 304
- true if the response has no headers
Help
- https://github.com/symfony/symfony/blob/0baa58d4e4bb006c4ae68f75833b586bd3cb6e6f/src/Symfony/Component/HttpFoundation/Response.php#L1090
true if the response status code are 204 or 304
isXmlHttpRequest

What will be the result of invoking the isXmlHttpRequest() method on a Symfony\Component\HttpFoundation\Request object?
Correct
- true if the request has the X-Requested-With header set to XMLHttpRequest.
The choices were
- true if the request has the X-Requested-With header set to XMLHttpRequest.
- true if the request must generate an XML response.
- true if the request contains XML content.
- true if the request has the Content-Type header set to application/xml.
Help
- https://github.com/symfony/http-foundation/blob/5.3/Request.php#L1763
true if the request has the X-Requested-With header set to XMLHttpRequest.
Booleans elements

Which of the following values are available to define a boolean element in YAML ?
Correct
- true
- false
The choices were
- 1
- false
- 0
- true
Help

http://symfony.com/doc/current/components/yaml/yaml_format.html#booleans

true false
Boolean Cast

What will be the value of $bool ?
```
$bool = (bool) "false"
```
Correct
- true
The choices were
- false
- true
- Error : you cannot cast a String as a Boolean
Help

http://php.net/manual/en/language.types.boolean.php

true
Command output

What is the default value when calling Command::setHidden()?
Correct
- true
The choices were
- true
- false
Help

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Console/Command/Command.php#L496

true
Customise the dump() global function

Which method should you call to customize the behavior of the global dump() function?
Wrong
- ```
trigger_error($callable);
```
The choices were
- ```
trigger_error($callable);
```
- ```
VarDumper::setDumper($callable);
```
- ```
VarDumper::setHandler($callable);
```
- ```
set_error_handler($callable);
```
Help
- https://symfony.com/doc/2.6/components/var_dumper/advanced.html
Dependency Injection Tags

What is the tag to register a custom service that loads translations?
Correct
- translation.loader
The choices were
- translation_loader
- translation.loader
- translator_loader
- translator.loader
Help
- http://symfony.com/doc/current/reference/dic_tags.html#translation-loader
translation.loader
Dependency Injection Tags

What is the tag to register a custom service that dumps messages to a file?
Correct
- translation.dumper
The choices were
- translation_dumper
- translator.dumper
- translator_dumper
- translation.dumper
Help
- http://symfony.com/doc/current/reference/dic_tags.html#translation-dumper
translation.dumper
DataTransformer

What are the methods of the Symfony\Component\Form\DataTransformerInterface interface?
Correct
- transform()
- reverseTransform()
The choices were
- reverseTransform()
- transformBack()
- transformReverse()
- getName()
- transform()
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/DataTransformerInterface.php
- http://symfony.com/doc/2.7/cookbook/form/data_transformers.html#creating-the-transformer
transform() reverseTransform()
Usage

Which of the following are Filesystem methods?
Correct
- touch
- isAbsolutePath
- chown
- rename
- dumpFile
- tempnam
The choices were
- dumpFile
- touch
- duplicate
- isAbsolutePath
- move
- rename
- chown
- tempnam
Help
- https://github.com/symfony/symfony/blob/5478a9d20d181e8d5a0ef532906e67b6d4d7bd79/src/Symfony/Component/Filesystem/Filesystem.php#L488
- https://symfony.com/doc/4.1/components/filesystem.html#tempnam
touch isAbsolutePath chown rename dumpFile tempnam
Requirement and default options behaviour
```
/**
 * @Route("/article/{id}", name="article", requirements={"id":"\d+"}, defaults={"id":"toto"})
 */
public function articleAction($id)
{
    return new Response($id);
}
```
With framework.router.strict_requirements parameter set to true what we should see when going on the /article URL?
Correct
- toto
The choices were
- toto
- Unable to find the controller for path "article". The route is wrongly configured.
- Parameter "id" for route "article" must match "\d+" ("toto" given)
Help
- http://symfony.com/doc/current/routing/requirements.html
- http://symfony.com/doc/current/reference/configuration/framework.html#strict-requirements
toto
Escape characters

Which of this following code is correct to use the percent character % in a translated string ?
Wrong
- ```
{% trans %}Percent: %percent%\%{% endtrans %}
```
  Twig
The choices were
- ```
{% trans %}Percent: %percent%%%{% endtrans %}
```
  Twig
- ```
{% trans %}Percent: %percent%{%}{% endtrans %}
```
  Twig
- ```
{% trans %}Percent: %percent%\%{% endtrans %}
```
  Twig
- ```
{% trans %}Percent: %percent%[%]{% endtrans %}
```
  Twig
Help

http://symfony.com/doc/current/translation.html#twig-templates

to use the percent character % in a translated string ? Wrong {% trans %}Percent: %percent%\%{% endtrans %}Twig

Multiple firewalls

Considering the following code, which one is correct to specify the default authentication mechanism ?

# config/packages/security.yaml
security:
    enable_authenticator_manager: true
    # ...
    firewalls:
        main:
            # allow authentication using a form or HTTP basic
            form_login: ~
            http_basic: ~
            # configure the form authentication as the entry point for unauthenticated users
            default_entry_point: form_login

# config/packages/security.yaml
security:
    enable_authenticator_manager: true
    # ...
    firewalls:
        main:
            # allow authentication using a form or HTTP basic
            form_login: ~
            http_basic: ~
            # configure the form authentication as the entry point for unauthenticated users
            default_entry_point: form_login

# config/packages/security.yaml
security:
    enable_authenticator_manager: true
    # ...
    firewalls:
        main:
            # allow authentication using a form or HTTP basic
            form_login: ~
            http_basic: ~
            # configure the form authentication as the entry point for unauthenticated users
            default_authentication_mechanism: form_login

# config/packages/security.yaml
security:
    enable_authenticator_manager: true
    # ...
    firewalls:
        main:
            # allow authentication using a form or HTTP basic
            form_login: ~
            http_basic: ~
            # configure the form authentication as the entry point for unauthenticated users
            entry_point: form_login

# config/packages/security.yaml
security:
    enable_authenticator_manager: true
    # ...
    firewalls:
        main:
            # allow authentication using a form or HTTP basic
            form_login: ~
            http_basic: ~
            # configure the form authentication as the entry point for unauthenticated users
            default: form_login

https://symfony.com/doc/current/security/authenticator_manager.html#configuring-the-authentication-entry-point

to specify the default authentication mechanism ? Wrong # config/packages/security.yaml security: enable_authenticator_manager: true # ... firewalls: main: # allow authentication using a form or HTTP basic form_login: ~ http_basic: ~ # configure the form authentication as the entry point for unauthenticated users default_entry_point: form_loginPHP

FrameworkBundle

When using AbstractController, what is the purpose of the second argument of the file method ?
Correct
- to set the name of the file
The choices were
- to set the name of the file
- to set the disposition of the file (inline or attachement)
- to set the mime type of the file
- to set the size of the file
Help
- https://symfony.com/doc/3.3/controller.html
to set the name of the file

Read the contents

Which of the following code is correct to read the contents of returned files ?

use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    $contents = $file->getContents();
    // ...
}

use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    $contents = $file->readContents();
    // ...
}

use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    $contents = $file->getContentsFile();
    // ...
}

use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    $contents = $file->readFile();
    // ...
}

use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    $contents = $file->read()->contents();
    // ...
}

use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    $contents = $file->getContents();
    // ...
}

to read the contents of returned files ? Correct use Symfony\Component\Finder\Finder; $finder = new Finder(); $finder->files()->in(__DIR__); foreach ($finder as $file) { $contents = $file->getContents(); // ... }PHP

EventSubscriber

Is the following class correct to be used as an event subscriber?
```
namespace Acme\Store\Event;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Acme\Store\Event\OrderPlacedEvent;
class StoreSubscriber
{
    public static function getSubscribedEvents()
    {
        return array(
            KernelEvents::RESPONSE => array(
                array('onKernelResponsePre', 10),
                array('onKernelResponsePost', -10),
            ),
            OrderPlacedEvent::NAME => 'onStoreOrder',
        );
    }
    public function onKernelResponsePre(FilterResponseEvent $event)
    {
        // ...
    }
    public function onKernelResponsePost(FilterResponseEvent $event)
    {
        // ...
    }
    public function onStoreOrder(OrderPlacedEvent $event)
    {
        // ...
    }
}
```
Correct
- No
The choices were
- Yes
- No
Help
- https://symfony.com/doc/current/components/event_dispatcher.html#using-event-subscribers
to be used as an event subscriber? namespace Acme\Store\Event; use Symfony\Component\HttpKernel\Event\FilterResponseEvent; use Symfony\Component\HttpKernel\KernelEvents; use Acme\Store\Event\OrderPlacedEvent; class StoreSubscriber { public static function getSubscribedEvents() { return array( KernelEvents::RESPONSE => array( array('onKernelResponsePre', 10), array('onKernelResponsePost', -10), ), OrderPlacedEvent::NAME => 'onStoreOrder', ); } public function onKernelResponsePre(FilterResponseEvent $event) { // ... } public function onKernelResponsePost(FilterResponseEvent $event) { // ... } public function onStoreOrder(OrderPlacedEvent $event) { // ... } }PHP Correct No
Usage

Given the following code, what will be stored in $string?
```
<?php
// ...
$string = u('template.html.twig')->trimSuffix(['.twig', '.html']);;
```
Wrong
- template
The choices were
- template.
- An error
- template.html.twig
- template
- template.html
Help
Usage

What is the correct syntax to create a new request?
Wrong
- ```
$httpClient = HttpClient::create();
$response = $httpClient->request('https://api.github.com/repos/symfony/symfony-docs', 'GET');
```
The choices were
- ```
$httpClient = HttpClient::create();
$response = $httpClient->request('GET', 'https://api.github.com/repos/symfony/symfony-docs');
```
- ```
$httpClient = HttpClient::create();
$response = $httpClient->request('https://api.github.com/repos/symfony/symfony-docs', 'GET');
```
Help
- https://symfony.com/doc/5.0/http_client.html#basic-usage
- https://github.com/symfony/symfony/blob/5.0/src/Symfony/Contracts/HttpClient/HttpClientInterface.php
syntax to create a new request? Wrong $httpClient = HttpClient::create(); $response = $httpClient->request('https://api.github.com/repos/symfony/symfony-docs', 'GET');PHP
Usage

Which of the following are Filesystem methods?
Correct
- symlink
- makePathRelative
- exists
- remove
- isAbsolutePath
The choices were
- move
- isAbsolutePath
- exists
- makePathRelative
- symlink
- remove
Help

https://symfony.com/doc/3.0/components/filesystem.html

symlink makePathRelative exists remove isAbsolutePath
Creating the project

According to the official Symfony Best Practices Guide and using the Symfony installer, which command allow you to create a blog application?
Correct
- symfony new --webapp blog
The choices were
- symfony create-project blog
- symfony install blog
- symfony create blog
- symfony new --webapp blog
Help

https://symfony.com/download

symfony new --webapp blog
Strings

Which function would best parse the following string by the tab (\t) and newline (\n) characters ?
```
$string = "John\tMark\nTed\tLarry";
```
Correct
- strtok($string, "\t\n");
The choices were
- strtok($string, "\t\n");
- strstr($string, "\t\n");
- explode($string, "\t\n");
- str_split($string, "\t\n");
Help
- http://php.net/manual/en/function.strtok.php
- http://php.net/manual/en/language.types.string.php
strtok($string, "\t\n");
Simple Validator Instance

With this following simple code:
```
use Symfony\Component\Validator\Validation;
$validator = Validation::createValidator();
```
Which variables types this $validator object can validate ?
Correct
- strings
- numbers
- arrays
The choices were
- arrays
- objects
- numbers
- strings
Help

http://symfony.com/doc/current/components/validator.html#retrieving-a-validator-instance

strings numbers arrays

Dumping Multi-line Literal Blocks

What will be the output of the following code?

$string = array("string" => "Multiple\nLine\nString");
$yaml = Yaml::dump($string, 2, 4, Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK);
echo $yaml;

string: |
     Multiple
     Line
     String

```
Multiple\nLine\nString
```
```
string: "Multiple\nLine\nString"
```
```
string: "Multiple
Line
String"
```
```
string: Multiple\nLine\nString
```

string: |
     Multiple
     Line
     String

```
"Multiple\nLine\nString"
```

http://symfony.com/doc/current/components/yaml.html#dumping-multi-line-literal-blocks

string: | Multiple Line String

Dumping Multi-line Literal Blocks

What will be the output of the following code?

$string = array("string" => "Multiple\nLine\nString");
$yaml = Yaml::dump($string);
echo $yaml;

string: |
     Multiple
     Line
     String

string: |
     Multiple
     Line
     String

```
string: Multiple\nLine\nString
```
```
Multiple\nLine\nString
```
```
string: "Multiple
Line
String"
```
```
string: "Multiple\nLine\nString"
```
```
"Multiple\nLine\nString"
```

http://symfony.com/doc/current/components/yaml.html#dumping-multi-line-literal-blocks

Dumping Multi-line Literal Blocks

What will be the output of the following code?

$string = array("string" => "Multiple\nLine\nString");
$yaml = Yaml::dump($string);
echo $yaml;

```
string: "Multiple
Line
String"
```

string: |
     Multiple
     Line
     String

```
Multiple\nLine\nString
```
```
string: "Multiple
Line
String"
```
```
string: Multiple\nLine\nString
```
```
"Multiple\nLine\nString"
```
```
string: "Multiple\nLine\nString"
```

http://symfony.com/doc/current/components/yaml.html#dumping-multi-line-literal-blocks

Registering Functions

What are the arguments of the register() method used to register a function?

string   $name      The function name
callable $compiler  A callable able to compile the function
callable $evaluator A callable able to evaluate the function

CompilerInterface  $compiler  A compiler able to compile the function
EvaluatorInterface $evaluator An evaluator able to evaluate the function

callable $compiler  A callable able to compile the function
callable $evaluator A callable able to evaluate the function

string   $name      The function name
callable $compiler  A callable able to compile the function
callable $evaluator A callable able to evaluate the function

string             $name      The function name
CompilerInterface  $compiler  A compiler able to compile the function
EvaluatorInterface $evaluator An evaluator able to evaluate the function

http://symfony.com/doc/current/components/expression_language/extending.html#registering-functions

string $name The function name callable $compiler A callable able to compile the function callable $evaluator A callable able to evaluate the function

Twig Extensions

According to the official Symfony Best Practices Guide, in which directory do you need to define your Twig extensions?
Correct
- src/Twig/
The choices were
- src/Twig/Extensions/
- src/Twig/
- src/Twig/Extension/
- src/Extensions/Twig/
- src/Extension/Twig/
Help
- https://symfony.com/doc/3.x/templating/twig_extension.html
- https://symfony.com/doc/4.0/best_practices/templates.html#twig-extensions
src/Twig/
Functions

Which of the following language structures and functions does not output anything?
Correct
- sprintf()
The choices were
- print_r()
- sprintf()
- print
- echo
- var_dump()
Help
sprintf()

Autoload

Assuming this code is at the root of the project, which function will allow PHP to automatically find the definitions for your classes?


spl_autoload_register(function ($class) {
    $filepath = str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php';
    include __DIR__ . $filepath;
});

spl_class_find(function ($class) {
    $filepath = str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php';
    include __DIR__ . $filepath;
});


spl_autoload_register(function ($class) {
    $filepath = str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php';
    include __DIR__ . $filepath;
});

spl_autoload(function ($class) {
    $filepath = str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php';
    return __DIR__ . $filepath;
});

spl_autoload_register(function ($class) {
    return __DIR__ . $class;
});

https://www.php.net/manual/en/function.spl-autoload-register.php

spl_autoload_register(function ($class) { $filepath = str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php'; include __DIR__ . $filepath; });PHP

Copy method

What is the correct signature of the Symfony\Component\Filesystem\Filesystem::copy method?
Correct
- ```
public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
```
The choices were
- ```
public function copy($originFile, $targetFile, $overwriteNewerFiles)
```
- ```
public function copy($targetFile, $originFile, $overwriteNewerFiles = false)
```
- ```
public function copy($originFile, $targetFile, $overwriteNewerFiles = false)
```
- ```
public function copy($targetFile, $originFile, $overwriteNewerFiles)
```
Help
- https://symfony.com/doc/2.7/components/filesystem.html#copy
- https://github.com/symfony/symfony/blob/4d0899c5e3b30b3be591f8349ce92529d79bee93/src/Symfony/Component/Filesystem/Filesystem.php#L40
signature of the Symfony\Component\Filesystem\Filesystem::copy method? Correct public function copy($originFile, $targetFile, $overwriteNewerFiles = false)PHP

Error handling

Consider the following code snippet:

trigger_error('This method is deprecated.');

Which of the following is valid way to catch and process errors that were triggered with the trigger_error() function?

set_error_handler(function ($level, $message, $file, $line, array $vars = []) {
    error_log($message);
    if ('cli' !== PHP_SAPI) {
        header('HTTP/1.1 500 Internal Server Error');
        echo 'Oops something wrong happened!';
        exit;
    }
});

set_error_handler(function ($level, $message, $file, $line, array $vars = []) {
    error_log($message);
    if ('cli' !== PHP_SAPI) {
        header('HTTP/1.1 500 Internal Server Error');
        echo 'Oops something wrong happened!';
        exit;
    }
});

try {
    trigger_error('This method is deprecated.');
} catch (\Exception $e) {
    // do something ...
}

try {
    trigger_error('This method is deprecated.');
} catch (\Error $e) {
    // do something
}

$errors = get_triggered_errors();
// do something

set_error_handler(function ($level, $message, $file, $line, array $vars = []) { error_log($message); if ('cli' !== PHP_SAPI) { header('HTTP/1.1 500 Internal Server Error'); echo 'Oops something wrong happened!'; exit; } });PHP

Expiration caching

Which methods can be used for expiration caching ?
Wrong
- setEtag
- setLastModified
- setMaxAge
- setExpires
The choices were
- setExpires
- setCache
- setLastModified
- setEtag
- setSharedMaxAge
- setMaxAge
Help
- https://symfony.com/doc/2.x/http_cache/expiration.html
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/Response.php

Alias

With the following service definition how is it possible to create an alias of the foo service?

services:
    foo:
        class: Example\Foo

services:
    foo:
        class: Example\Foo
    bar:
        alias: foo

services:
    foo:
        class: Example\Foo
        alias: bar

services:
    foo:
        class: Example\Foo
    bar: '@foo'

services:
    foo:
        class: Example\Foo
        alias:
            - bar

services:
    foo:
        class: Example\Foo
    bar:
        alias: foo

services:
    foo:
        class: Example\Foo
        alias: [bar]

services:
    foo:
        class: Example\Foo
        alias: bar

https://symfony.com/doc/2.7/service_container/alias_private.html#aliasing

Alias

With the following service definition how is it possible to create an alias of the foo service?

services:
    foo:
        class: Example\Foo

services:
    foo:
        class: Example\Foo
        alias: bar

services:
    foo:
        class: Example\Foo
        alias: [bar]

services:
    foo:
        class: Example\Foo
        alias:
            - bar

services:
    foo:
        class: Example\Foo
        alias: bar

services:
    foo:
        class: Example\Foo
    bar: '@foo'

services:
    foo:
        class: Example\Foo
        alias: [bar]

services:
    foo:
        class: Example\Foo
    bar:
        alias: foo

https://symfony.com/doc/2.7/service_container/alias_private.html#aliasing

Alias

With the following service definition how is it possible to create an alias of the foo service?

services:
    foo:
        class: Example\Foo

services:
    foo:
        class: Example\Foo
        alias: bar

services:
    foo:
        class: Example\Foo
        alias:
            - bar

services:
    foo:
        class: Example\Foo
        alias: [bar]

services:
    foo:
        class: Example\Foo
        alias: bar

services:
    foo:
        class: Example\Foo
        alias:
            - bar

services:
    foo:
        class: Example\Foo
    bar: '@foo'

services:
    foo:
        class: Example\Foo
    bar:
        alias: foo

services:
    foo:
        class: Example\Foo
        alias: [bar]

https://symfony.com/doc/2.7/service_container/alias_private.html#aliasing

Dependency Injection Tags

What is the tag to register a new normalizer in the serializer service?
Correct
- serializer.normalizer
The choices were
- serializer_normalizer
- serializer.object_normalizer
- serializer.normalizer
- serializer.normalize
Help
- http://symfony.com/doc/current/reference/dic_tags.html#serializer-normalizer
serializer.normalizer
Dependency Injection Tags

What is the tag to register a new encoder in the serializer service?
Correct
- serializer.encoder
The choices were
- serializer_encoder
- serializer.encoder
- serializer.encode
- serializer.object_encoder
Help
- http://symfony.com/doc/current/reference/dic_tags.html#serializer-encoder
serializer.encoder
Xml parameters

What will be the value of the following configuration sample?
```
<parameter key="mailer.transport">
    sendmail
</parameter>
```
XML
Wrong
- sendmail
The choices were
- ```
\n
    sendmail\n
```
- ```
\n
 sendmail\n
```
- sendmail\n
- sendmail
Help

The values between parameter tags in XML configuration files are not trimmed. https://symfony.com/doc/4.4/configuration.html#configuration-parameters
Command usage

Which command is used to hash a password?
Correct
- security:hash-password
The choices were
- security:hash-password
- security:generate-password
- security:encode-password
- security:new-password
Help

https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/PasswordHasher/Command/UserPasswordHashCommand.php

security:hash-password

Anonymous Users

Using the new Authenticator-Based Security, how to allow some routes to be accessed by anonymous users?

security:
    access_control:
        - { path: ^/admin/login, roles: PUBLIC_ACCESS }

security:
    access_control:
        - { path: ^/admin/login, roles: ANONYMOUS_ACCESS }

security:
    access_control:
        - { path: ^/admin/login, roles: UNAUTHENTICATED_ACCESS }

security:
    access_control:
        - { path: ^/admin/login, roles: PUBLIC_ACCESS }

https://symfony.com/doc/6.0/security.html#allowing-unsecured-access-i-e-anonymous-users

security: access_control: - { path: ^/admin/login, roles: PUBLIC_ACCESS }YAML

Configuring a Voter

When creating custom voter, which dependency injection tag has to be used?
Correct
- security.voter
The choices were
- secure.voter
- secure.vote
- security.vote
- security.voter
Help
- http://symfony.com/doc/current/reference/dic_tags.html#security-voter
- http://symfony.com/doc/current/security/voters.html#configuring-the-voter
security.voter
Dependency Injection Tags

What is the tag to add a custom voter to Symfony's authorization logic?
Correct
- security.voter
The choices were
- security.authorization_voter
- security.voter
- security_voter
- security.auth_voter
Help
- http://symfony.com/doc/current/reference/dic_tags.html#security-voter
security.voter
Dependency Injection Tags

What is the tag to register a provider for expression language functions in security?
Correct
- security.expression_language_provider
The choices were
- security_provider
- security.provider
- security.expression_language_provider
Help
- http://symfony.com/doc/current/reference/dic_tags.html#security-expression-language-provider
security.expression_language_provider
Domain

When you want to use a translation in another domain than the default domain, you must specify the domain as:
Wrong
- second argument of trans()
The choices were
- first argument of trans()
- fourth argument of trans()
- second argument of trans()
- third argument of trans()
Help
- https://github.com/symfony/symfony/blob/0baa58d4e4bb006c4ae68f75833b586bd3cb6e6f/src/Symfony/Component/Translation/Translator.php#L169
NumberType precision

What is the option you can pass to a Symfony\Component\Form\Extension\Core\Type\NumberType form type to change the number of decimals allowed until the field rounds.
Correct
- scale
The choices were
- decimals
- precision
- scale
Help

http://symfony.com/doc/current/reference/forms/types/number.html

scale
Custom Route Loader

When creating custom loader, which dependency injection tag has to be used?
Correct
- routing.loader
The choices were
- router.load
- router.loader
- routing.load
- routing.loader
Help
- https://symfony.com/doc/2.7/routing/custom_route_loader.html
- https://symfony.com/doc/2.0/reference/dic_tags.html#routing-loader
routing.loader
Dependency Injection Tags

What is the tag to register a custom service that loads routes?
Correct
- routing.loader
The choices were
- router.route_loader
- router_loader
- routing_loader
- routing.loader
- routing.route_loader
- router.loader
Help
- http://symfony.com/doc/current/reference/dic_tags.html#routing-loader
routing.loader
Dependency Injection Tags

What is the tag to register a provider for expression language functions in routing?
Correct
- routing.expression_language_provider
The choices were
- router.expression_language_provider
- router.provider
- router.route_provider
- routing.expression_language_provider
- routing.route_provider
- routing.provider
Help
- http://symfony.com/doc/current/reference/dic_tags.html#routing-expression-language-provider
routing.expression_language_provider
Cryptographically secure random integer

Which native function should you use to generate a cryptographically secure random integer?
Correct
- random_int()
The choices were
- rand()
- mt_rand()
- random_int()
- lcg_value()
Help
- https://www.php.net/manual/en/ref.random.php
random_int()
PHPUnit

Which is the method that allows to execute some code only after the last test defined by a class?
Correct
- public static function tearDownAfterClass()
The choices were
- public static function tearDown()
- public static function tearDownAfterClass()
- public function tearDownAfterClass()
- public function tearDown()
Help

https://phpunit.de/manual/current/en/fixtures.html#fixtures.more-setup-than-teardown

public static function tearDownAfterClass()
PHPUnit

Which is the method that allows to execute some code only before the first test defined by a class?
Correct
- public static function setUpBeforeClass()
The choices were
- public function setUp()
- public static function setUp()
- public function setUpBeforeClass()
- public static function setUpBeforeClass()
Help

https://phpunit.de/manual/current/en/fixtures.html#fixtures.more-setup-than-teardown

public static function setUpBeforeClass()

Data providers

Which of the following methods are valid PHPUnit data providers?

public static function provideUrls()
{
    return [
        ['/homepage', 200],
        ['/login', 403],
        ['/blog/archives', 200],
    ];
}

public static function provideUrls()
{
    yield ['/homepage', 200];
    yield ['/login', 403];
    yield ['/blog/archives', 200];
}

public static function provideUrls()
{
    return ['/homepage', 200];
    return ['/login', 403];
    return ['/blog/archives', 200];
}

public static function provideUrls($i)
{
    $data = array(
        0 => ['/homepage', 200];
        1 => ['/login', 403];
        2 => ['/blog/archives', 200];
    );
    return $data[$i];
}

public static function provideUrls()
{
    return iterator_to_array(
        ['/homepage', 200],
        ['/login', 403],
        ['/blog/archives', 200],
    );
}

public static function provideUrls()
{
    return [
        ['/homepage', 200],
        ['/login', 403],
        ['/blog/archives', 200],
    ];
}

public static function provideUrls()
{
    yield ['/homepage', 200];
    yield ['/login', 403];
    yield ['/blog/archives', 200];
}

https://phpunit.de/manual/current/en/writing-tests-for-phpunit.html#writing-tests-for-phpunit.data-providers

public static function provideUrls() { return [ ['/homepage', 200], ['/login', 403], ['/blog/archives', 200], ]; }PHP public static function provideUrls() { yield ['/homepage', 200]; yield ['/login', 403]; yield ['/blog/archives', 200]; }PHP

ServiceSubscriberInterface

Which method is to be implemented from a ServiceSubscriberInterface?
Correct
- ```
public static function getSubscribedServices()
```
The choices were
- ```
public static function setSubscribedServices()
```
- ```
public static function addSubscribedService()
```
- ```
public static function getSubscribedServices()
```
- ```
public function setSubscribedServices()
```
Help
- https://github.com/symfony/symfony/blob/5.4/src/Symfony/Contracts/Service/ServiceSubscriberInterface.php
public static function getSubscribedServices()PHP

Voters

What is the signature of the vote() method from VoterInterface?

public function vote(TokenInterface $token, $subject, array $attributes)

public function vote(TokenInterface $token, $object, array $attributes)

public function vote(TokenInterface $token, array $attributes, $object)

public function vote(TokenInterface $token, $subject, array $attributes)

public function vote(TokenInterface $token, array $attributes, $subject)

https://github.com/symfony/symfony/blob/3.0/src/Symfony/Component/Security/Core/Authorization/Voter/VoterInterface.php

public function vote(TokenInterface $token, $subject, array $attributes)PHP

Data providers

Which of the following is a valid code to make a data provider working ?

public function provideFoo(): array
{
    return [
        'general case' => [1, 2, 5],
        'specific case' => [2, 7, 4],
    ];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

public function provideFoo(): array
{
    return [
        [1, 2, 5],
    ];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

public function provideFoo(): \Generator
{
    yield 'generic case' => [1, 2, 5];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

public function provideFoo(): array
{
    return [1, 2, 5];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

private function provideFoo(): array
{
    return [
        [1, 2, 5],
    ];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

private function provideFoo(): array
{
    return [1, 2, 5];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

public function provideFoo(): array
{
    return [
        [1, 2, 5],
    ];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

public function provideFoo(): \Generator
{
    yield 'generic case' => [1, 2, 5];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

public function provideFoo(): array
{
    return [
        'general case' => [1, 2, 5],
        'specific case' => [2, 7, 4],
    ];
}
/**
 * @dataprovider provideFoo
 */
public function testFoo(int $value1, int $value2, int $expectedValue): void
{
    //...
}

https://phpunit.de/manual/5.7/en/writing-tests-for-phpunit.html#writing-tests-for-phpunit.data-providers data provider method must be public. Since data providers can return an iterator, generators can be used.

public function provideFoo(): array { return [ 'general case' => [1, 2, 5], 'specific case' => [2, 7, 4], ]; } /** * @dataprovider provideFoo */ public function testFoo(int $value1, int $value2, int $expectedValue): void { //... }PHP public function provideFoo(): array { return [ [1, 2, 5], ]; } /** * @dataprovider provideFoo */ public function testFoo(int $value1, int $value2, int $expectedValue): void { //... }PHP public function provideFoo(): \Generator { yield 'generic case' => [1, 2, 5]; } /** * @dataprovider provideFoo */ public function testFoo(int $value1, int $value2, int $expectedValue): void { //... }PHP

Translator

Which method must implement a TranslationLoader that implements Symfony\Component\Translation\Loader\LoaderInterface?

public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue;

public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue;

public function load(mixed $resource, string $locale, string $domain): MessageCatalogue;

public function load(string $resource, $locale = 'en', $domain = 'messages'): MessageCatalogue;

public function load(string $resource, string $locale, string $domain = 'messages'): MessageCatalogue;

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Translation/Loader/LoaderInterface.php

public function load(mixed $resource, string $locale, string $domain = 'messages'): MessageCatalogue;PHP

Translator

Which methods must be implemented by classes that implements Symfony\Component\Translation\Loader\LoaderInterface?

public function load($resource, $locale, $domain = 'messages');

public function load($resource, $locale, $domain = 'messages');

public function load($resource, $locale, $domain);

```
public function load($locale, $domain);
```

public function load($locale = 'en', $domain = 'messages');

public function load($resource, $locale = 'en', $domain = 'messages');

https://github.com/symfony/translation/blob/2.3/Loader/LoaderInterface.php

public function load($resource, $locale, $domain = 'messages');PHP

`ResponseInterface::getHeaders` signature

What is the signature of the Symfony\Contracts\HttpClient\ResponseInterface::getHeaders method?
Correct
- public function getHeaders(bool $throw = true): array
The choices were
- public function getHeaders(): array
- public function getHeaders(bool $throw = false): array
- public function getHeaders(bool $throw = true): array
Help

https://symfony.com/doc/6.0/http_client.html#handling-exceptions

public function getHeaders(bool $throw = true): array
Converting Property Names when Serializing and Deserializing

What are the methods of Symfony\Component\Serializer\NameConverter\NameConverterInterface?
Correct
- ```
public function denormalize($propertyName);
```
- ```
public function normalize($propertyName);
```
The choices were
- ```
public function getName();
```
- ```
public function normalize($propertyName);
```
- ```
public function denormalize($propertyName);
```
- ```
public function reverse($propertyName);
```
Help
- https://symfony.com/doc/2.7/components/serializer.html#converting-property-names-when-serializing-and-deserializing
- https://github.com/symfony/symfony/blob/2.7/src/Symfony/Component/Serializer/NameConverter/NameConverterInterface.php
public function denormalize($propertyName);PHP public function normalize($propertyName);PHP

Options

What is the method signature to configure the options in a form?

public function configureOptions(OptionsResolver $resolver)

public function configureOptions(OptionsResolverInterface $resolver)

public function setDefaultOptions(OptionsResolverInterface $resolver)

public function setDefaultOptions(OptionsResolver $resolver)

public function configureOptions(OptionsResolver $resolver)

http://symfony.com/doc/current/book/forms.html

public function configureOptions(OptionsResolver $resolver)PHP

PHPUnit

Which is the method that allows to execute some code before each test defined by a class?
Correct
- protected function setUp()
The choices were
- protected static function setUpBeforeClass()
- protected function setUpBeforeClass()
- protected static function setUp()
- protected function setUp()
Help

https://phpunit.de/manual/current/en/fixtures.html#fixtures.more-setup-than-teardown

protected function setUp()
Dependency injection

Which injection types are supported by Symfony's Dependency Injection Container?
Correct
- property
- setter
- constructor
The choices were
- setter
- getter
- constructor
- property
Help
- https://symfony.com/doc/current/service_container.html
- https://symfony.com/doc/current/service_container/injection_types.html
property setter constructor
Dependency Injection Tags

What is the tag to use to create a class that collects custom data for the profiler?
Wrong
- profiler.data_collector
The choices were
- debug.data_collector
- data_collector
- profiler.data_collector
- kernel.data_collector
Help
- http://symfony.com/doc/current/reference/dic_tags.html#data-collector
Processes

From the script below, how would you display the error messages thrown by the 'ls' command ?
```
$null = fopen('/dev/null', 'r+');
$descriptorspec = [0 => $null, 1 => $null, 2 => array("pipe", "w")];
$process = proc_open("ls /foo", $descriptorspec, $pipes);
echo __________________
```
Wrong
- proc_errors($process);
The choices were
- proc_errors($process);
- fgets($pipes[2]);
- fread($null, 128);
- stream_errors($pipes);
Help
- http://php.net/manual/en/function.fgets.php
- http://php.net/manual/en/function.proc-open.php
Streams

Which of the following is NOT a default PHP input or output stream ?
Correct
- php://error
The choices were
- php://stdout
- php://error
- php://output
- php://stdin
- php://input
Help
- http://php.net/manual/en/features.commandline.io-streams.php
- http://php.net/manual/en/wrappers.php.php
php://error
Finder methods

Which methods belong to Symfony\Component\Finder\Finder class ?
Correct
- path
- name
- size
- notPath
- notName
The choices were
- type
- notSize
- owner
- size
- name
- notPath
- path
- notName
Help
- https://symfony.com/doc/2.3/components/finder.html
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Finder/Finder.php
path name size notPath notName

Directories

What is the correct option to add other directories in the translator configuration?

# config/packages/translation.yaml
framework:
    translator:
        paths:
            - '%kernel.project_dir%/translations'

# config/packages/translation.yaml
framework:
    translator:
        paths:
            - '%kernel.project_dir%/translations'

# config/packages/translation.yaml
framework:
    translator:
        directories:
            - '%kernel.project_dir%/translations'

# config/packages/translation.yaml
framework:
    translator:
        custom_directories:
            - '%kernel.project_dir%/translations'

# config/packages/translation.yaml
framework:
    translator:
        add_paths:
            - '%kernel.project_dir%/translations'

# config/packages/translation.yaml
framework:
    translator:
        custom_paths:
            - '%kernel.project_dir%/translations'

https://symfony.com/doc/current/reference/configuration/framework.html#reference-translator-paths

option to add other directories in the translator configuration? Correct # config/packages/translation.yaml framework: translator: paths: - '%kernel.project_dir%/translations'YAML

FormTypeGuesser usage

Which types are returned by FormTypeGuesserInterface::guessMaxLength()?
Wrong
- null
- GuessedValue
The choices were
- null
- GuessedValue
- ResolvedValue
- ValueGuessed
- ValueGuess
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/FormTypeGuesserInterface.php

FlashBag use

What will be the response's content when calling FooController::action?

class FooController extends AbstractController
{
    public function action(): Response
    {
        $this->addFlash('notice', 'First notice');
        $this->addFlash('notice', 'Second notice');
        $this->addFlash('error', 'First error');
        $this->addFlash('error', 'Second error');
        return $this->render('flash.html.twig');
    }
}

{# templates/flash.html.twig #}
{% for message in app.session.flashBag.peek('notice') %}
    {{ 'notice: ' ~ message }}
{% endfor %}
{% for label, messages in app.session.flashBag.all %}
   {% for message in messages %}
     {{ label ~ ': ' ~ message }}
   {% endfor %}
{% endfor %}

notice: First notice
notice: Second notice
notice: First notice
notice: Second notice
error: First error
error: Second error

notice: First notice
notice: Second notice
error: First error
error: Second error

notice: First notice
notice: Second notice
notice: First notice
notice: Second notice
error: First error
error: Second error

notice: Second notice
notice: First notice
error: Second error
error: First error
notice: Second notice
notice: First notice

error: Second error
error: First error
notice: Second notice
notice: First notice

https://symfony.com/doc/6.0/controller.html#flash-messages

notice: First notice notice: Second notice notice: First notice notice: Second notice error: First error error: Second error

Cache-Control

Which Cache-Control directive disallows the browser and all intermediate caches from storing any version of the returned response ?
Correct
- no-store
The choices were
- no-cache
- public
- no-store
- private
Help
- https://tools.ietf.org/html/rfc7234#section-5.2.1.5
- https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=en#cache-control
no-store
Validator

Which of the following values doesn't trigger a violation when the Date constraint is applied to it?
Wrong
- new \DateTime('2020-01-15')
- null
- '2020-01-15'
The choices were
- null
- new \DateTime('2020-01-15')
- '2020-01-15'
- '2020-13-15'
- '15/01/2020'
- '15/13/2020'
Help
Validator

Which of the following values doesn't trigger a violation when the Date constraint is applied to it?
Wrong
- new \DateTime('2020-01-15')
- '2020-01-15'
The choices were
- '15/01/2020'
- new \DateTime('2020-01-15')
- '15/13/2020'
- '2020-01-15'
- '2020-13-15'
- null
Help
Functions

Which of the following is not a built-in function anymore as of PHP 7.0?
Correct
- mysql_connect()
The choices were
- mysql_connect()
- date()
- in_array()
- metaphone()
Help
mysql_connect()
Object Oriented Programming

What will be the output of the following code (in PHP 5 / 7 / 8.0) ?
```
<?php
interface Foo
{
  const MY_CONST = 'my_value';
}
class Bar implements Foo
{
  const MY_CONST = 'my_overriden_value';
}
echo Bar::MY_CONST;
```
Wrong
- my_overriden_value
The choices were
- An error
- my_overriden_value
- my_value
Help
- https://www.php.net/manual/en/language.oop5.interfaces.php
- https://www.php.net/manual/en/language.oop5.interfaces.php#language.oop5.interfaces.constants
DIC configuration

Which DIC tag is used by MimeType?
Correct
- mime_types
The choices were
- mime_types
- mime_type
- mime.types
Help
- https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/Mime/DependencyInjection/AddMimeTypeGuesserPass.php#L30
mime_types
Cache expiration

Which headers/directives will be ignored by a proxy if Expires, s-maxage and max-age are all present in a response ?
Correct
- max-age
- Expires
The choices were
- Expires
- max-age
- s-maxage
Help
max-age Expires
Dependency Injection

Given we add the following extension to the container:
```
$fooExtension = new FooExtension();
$container = new ContainerBuilder();
$container->registerExtension($fooExtension);
```
What extra steps are needed in order to trigger the load method of FooExtension ?
Wrong
- load a config file via a container loader (YamlFileLoader, XmlFileLoader...) OR call $container->loadFromExtension($fooExtension->getAlias())
- call $container->loadFromExtension($fooExtension)
The choices were
- call container->compile()
- call $container->loadFromExtension($fooExtension)
- load a config file via a container loader (YamlFileLoader, XmlFileLoader...) AND call $container->loadFromExtension($fooExtension->getAlias())
- load a config file via a container loader (YamlFileLoader, XmlFileLoader...) OR call $container->loadFromExtension($fooExtension->getAlias())
Help
- https://symfony.com/doc/2.3/components/dependency_injection/compilation.html
Basics

The ___________ language construct is particularly useful to assign your own variable names to values within an array.
Correct
- list()
The choices were
- array_get_variables()
- each()
- import_variables()
- list()
- current()
Help
- http://php.net/manual/en/language.variables.php
- http://php.net/list
list()
Command lifecycle

Which of the following describes the correct lifecycle of a Command?
Correct
- initialize -> interact -> execute
The choices were
- interact -> initialize -> execute
- initialize -> interact -> execute
- initialize -> execute -> interact
Help

https://symfony.com/doc/6.0/console.html#command-lifecycle

lifecycle of a Command? Correct initialize -> interact -> execute
Array functions

What line of code should be substituted with /** line **/ to achieve an output of a?
```
<?php
$fruitAndVeg = [
    'c' => 'Carrot',
    'p' => 'Tomato',
    'b' => 'Banana',
    't' => 'Potato',
    'a' => 'Apple'
];
/** line **/
$keys = array_keys($fruitAndVeg);
echo $keys[0];
```
Correct
- ksort($fruitAndVeg);
The choices were
- usort($fruitAndVeg);
- sort($fruitAndVeg);
- krsort($fruitAndVeg);
- ksort($fruitAndVeg);
Help
ksort($fruitAndVeg);
HttpKernel Events

Which of the following kernel events should you listen to in order to modify the HTTP response before it is sent back to the client?
Wrong
- kernel.view
- kernel.response
The choices were
- kernel.controller
- kernel.view
- kernel.finish_request
- kernel.terminate
- kernel.request
- kernel.response
Help

https://symfony.com/doc/current/components/http_kernel.html
HttpKernel Events

In which order does Symfony trigger the following events?
Correct
- 1. kernel.request
  2. kernel.controller
  3. kernel.controller_arguments
  4. kernel.view
  5. kernel.response
  6. kernel.finish_request
  7. kernel.terminate
The choices were
- 1. kernel.request
  2. kernel.controller
  3. kernel.controller_arguments
  4. kernel.response
  5. kernel.view
  6. kernel.terminate
  7. kernel.finish_request
- 1. kernel.request
  2. kernel.controller
  3. kernel.controller_arguments
  4. kernel.view
  5. kernel.response
  6. kernel.terminate
  7. kernel.finish_request
- 1. kernel.request
  2. kernel.controller
  3. kernel.controller_arguments
  4. kernel.view
  5. kernel.response
  6. kernel.finish_request
  7. kernel.terminate
- 1. kernel.request
  2. kernel.controller
  3. kernel.controller_arguments
  4. kernel.response
  5. kernel.view
  6. kernel.finish_request
  7. kernel.terminate
Help

https://symfony.com/doc/4.2/components/http_kernel.html#creating-an-event-listener

kernel.request kernel.controller kernel.controller_arguments kernel.view kernel.response kernel.finish_request kernel.terminate
Locale aware services

Which tag will be applied to the following service once registered?
```
<?php
namespace App\Service;
use Symfony\Contracts\Translation\LocaleAwareInterface;
final class LocaleHelper implements LocaleAwareInterface
{
  public function setLocale(string $locale): void
  {
    // ...
  }
  public function getLocale(): string
  {
    return 'en';
  }
}
```
Correct
- kernel.locale_aware
The choices were
- locale_aware
- kernel.locale_entrypoint
- None
- locale_listener
- kernel.locale_aware
- kernel.locale_listener
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php#L386

kernel.locale_aware
Dependency Injection Tags

What is the tag to add a new HTTP content rendering strategy?
Correct
- kernel.fragment_renderer
The choices were
- kernel.renderer
- kernel.content_renderer
- kernel.fragment_renderer
- fragment_renderer
- content_renderer
- renderer
Help
- http://symfony.com/doc/current/reference/dic_tags.html#kernel-fragment-renderer
kernel.fragment_renderer
SensioFrameworkExtraBundle

Which event does the ParamConverterListener listen to ?
Correct
- kernel.controller
The choices were
- kernel.request
- kernel.controller
- kernel.controller_arguments
Help

https://github.com/sensiolabs/SensioFrameworkExtraBundle/blob/2.3/EventListener/ParamConverterListener.php

kernel.controller
FrameworkBundle

When using RedirectController, which routing param allows to redirect with a 307/308 status code ?
Correct
- keepRequestMethod
The choices were
- status_code
- http_status
- keepRequestMethod
- statusCode
Help
- https://symfony.com/doc/4.1/routing/redirect_in_config.html
keepRequestMethod
FrameworkBundle

When using Twig in the full stack framework, which of these configuration keys are related to cache busting?
Correct
- json_manifest_path
- version
- version_strategy
- version_format
The choices were
- hash
- version_map
- json_manifest_path
- version_hash
- version_strategy
- version
- version_format
Help

https://symfony.com/doc/3.3/reference/configuration/framework.html#packages

json_manifest_path version version_strategy version_format
Yield and function prototype

What is missing in the following code snippet in place of ??? ?
```
$f = function (): ??? {
    yield null;
};
```
Correct
- iterable
The choices were
- iterable
- use (Iterable)
- array
- void
Help

http://php.net/manual/en/language.types.iterable.php

iterable
HttpKernel

Which sentences about AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER are true ?
Wrong
- it's designed to be used as a response header
- it's related to the no-cache property of cache-control
- it's related to the no-store property of cache-control
The choices were
- it's related to the public/private property of cache-control
- it's related to the no-cache property of cache-control
- it's designed to be used as a SessionInterface option
- it's related to the no-store property of cache-control
- it's related to session storage strategy
- it's designed to be used as a request header
- it's designed to be used as a response header
Help

https://github.com/symfony/http-kernel/blob/4.1/EventListener/AbstractSessionListener.php
Dependency Injection

What is true about ContainerConfigurator?
Wrong
- it allows to configure a service after its instanciation
The choices were
- it allows to work with service definitions
- it allows to configure a service after its instanciation
- it's an internal class that you should not use in your application
- it doesn't exist
Help
- https://symfony.com/doc/5.3/service_container.html (See container configuration examples with PHP)
- https://github.com/symfony/dependency-injection/blob/5.3/Loader/Configurator/ContainerConfigurator.php
- The ContainerConfigurator (which is capable of configuring the container) should not be confused with a "service configurator" that allows to apply extra configuration logic to a specific service: https://symfony.com/doc/2.x/service_container/configurators.html
The FrameworkBundle Base Controller Class

Which of the following are valid methods of the Symfony base controller class?
Correct
- isCsrfTokenValid()
- redirectToRoute()
- denyAccessUnlessGranted()
The choices were
- denyAccessUnlessGranted()
- isCsrfTokenValid()
- createXmlResponse()
- generatePath()
- redirectToRoute()
Help

Symfony 3 : https://github.com/symfony/symfony/blob/3.0/src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php

Symfony 4 and later : https://github.com/symfony/symfony/blob/4.0/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php

isCsrfTokenValid() redirectToRoute() denyAccessUnlessGranted()
The Type validation constraint

Which of the following are valid values for the type option of the Symfony\Component\Validator\Constraints\Type validation constraint ?
Wrong
- integer
- email
The choices were
- digit
- integer
- alpha
- graph
- email
- xml
Help
- https://symfony.com/doc/current/reference/constraints/Type.html
You can use ctype_ functions from corresponding built-in PHP extension (http://php.net/manual/en/ref.ctype.php)
`Command::execute` return type

What is the return type of the Symfony\Component\Console\Command\Command::execute method?
Correct
- int
The choices were
- int
- ?int
- ?bool
- void
- bool
Help

https://symfony.com/doc/6.0/console.html#creating-a-command https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Console/Command/Command.php#L293-L295

int
Button types

Which type does not correspond to a button?
Correct
- input
The choices were
- submit
- button
- input
- reset
Help

https://symfony.com/doc/2.3/reference/forms/types.html#buttons

input
SSI Symfony support

Which SSI (Server Side Includes) directive is supported by Symfony?
Correct
- include ()
The choices were
- config ()
- include ()
- echo ()
- flastmod ()
- exec ()
Help

https://symfony.com/doc/6.0/http_cache/ssi.html

include ()
Security providers

Which of these are Symfony built-in security providers configuration name?
Wrong
- in_memory
- ldap
- chain
The choices were
- chain
- ldap
- doctrine
- in_memory
- memory
Help
- https://symfony.com/doc/3.0/reference/configuration/security.html
- https://symfony.com/doc/3.0/security.html#security-user-providers
Translation Source File Location

According to the official Symfony Best Practices Guide, where do you need to store the translation files?
Wrong
- in the translations/<language> directory
The choices were
- in the src/Resources/translations/ directory of each bundle
- in the src/Resources/translations/<language> directory of each bundle
- in the translations/<language> directory
- in the translations/ directory
Help

https://symfony.com/doc/current/best_practices/i18n.html#translation-source-file-location

PHP objects general

When checking to see if two variables contain the same instance of an object, which of the following comparisons should be used ?

```
if ($obj1->equals($obj2)) { }
```

```
if ($obj1 instanceof $obj2) { }
```
```
if ($obj1->equals($obj2)) { }
```
```
if ($obj1 = $obj2) { }
```
```
if ($obj1 === $obj2) { }
```
```
if ($obj1 == $obj2) { }
```

if ($obj1 instanceof $obj2 && $obj1->equals($obj2)) { }

http://php.net/manual/en/language.oop5.object-comparison.php

The "with" tag

In the following Twig template:
```
{% set maxItems = 10 %}
{% with { maxItems: 5 } %}
    {% for i in 1..maxItems %}
        {# ... #}
    {% endfor %}
{% endwith %}
{% for j in 1..maxItems %}
    {# ... #}
{% endfor %}
```
Twig
Which will be the last values iterated by i and j variables in the for loops?
Correct
- i = 5 and j = 10
The choices were
- i = 5 and j = 5
- i = 5 and j = 10
- i = 10 and j = 5
- i = 10 and j = 10
Help

Twig 1.28 (November 2016) introduced a new with tag that allows to create different scopes in the same template. Variables defined inside a with tag are not available outside of it and don't modify the external variables. See https://twig.symfony.com/doc/tags/with.html

i = 5 and j = 10
Route definition

Consider the following route definition:
```

<?xml version="1.0" encoding="UTF-8" ?>
<routes ...>
    <route id="forum_thread"
        path="/category/{slug}/thread-{id}.html" 
        methods="GET" 
        host="forum.domain.tld"
        controller="App\Controller\ForumController::thread">
    </route>
</routes>
```
XML
Which of the following URL patterns will match the forum_thread route?
Wrong
- http://www.domain.tld/category/73/thread-hello-world.html
- http://forum.domain.tld/category/documentary/thread-aircrafts-mega-factory.html
- http://forum.domain.tld/category/programming/thread-42.html?page=3
The choices were
- http://forum.domain.tld/category/documentary/thread-aircrafts-mega-factory.html
- http://forum.domain.tld/category/18-roles-games/world-of-warcraft.html
- http://www.domain.tld/category/73/thread-hello-world.html
- http://forum.domain.tld/category/tv-shows/thread-dexter?page=3
- http://forum.domain.tld/category/programming/thread-42.html?page=3
Help
- https://symfony.com/doc/current/routing.html
- https://symfony.com/doc/current/components/routing.html
Interpretation

Consider the following code snippet:
```
echo print('hello');
```
What will be the output when running this script?
Wrong
- ```
hello
```
The choices were
- ```
hello5
```
- ```
hello
```
- ```
hellotrue
```
- ```
hello1
```
- ```
hello0
```
Help
- http://php.net/echo
- http://php.net/print
Subscribing to Events

What methods must a class implementing EventSubscriberInterface implement ?
Correct
- getSubscribedEvents()
The choices were
- getSubscribedEvents()
- onEvent()
- handleEvent()
- listenToEvents()
- subscribeToEvents()
Help
- https://symfony.com/doc/5.x/components/event_dispatcher.html#using-event-subscribers
getSubscribedEvents()
KernelEvent

What are the methods available in Symfony\Component\HttpKernel\Event\KernelEvent?
Correct
- getRequest
- getRequestType
- isMainRequest
- getKernel
The choices were
- hasRequest
- hasResponse
- getException
- getResponse
- hasException
- getRequest
- getRequestType
- isMainRequest
- getKernel
Help

https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/HttpKernel/Event/KernelEvent.php

getRequest getRequestType isMainRequest getKernel
Expression Function Provider

What are the methods of Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface?
Correct
- ```
getFunctions();
```
The choices were
- ```
getFunctions();
addFunction(ExpressionFunction $function);
```
- ```
getFunctions();
register($name, callable $compiler, callable $evaluator);
```
- ```
getFunctions();
```
- ```
getFunctions();
register($name, callable $compiler, callable $evaluator);
addFunction(ExpressionFunction $function);
```
Help

https://github.com/symfony/symfony/blob/2.6/src/Symfony/Component/ExpressionLanguage/ExpressionFunctionProviderInterface.php

getFunctions();PHP
Extension helper in File

In Symfony\Component\HttpFoundation\File\File: what is the difference between the getExtension() method and the guessExtension() method?
Correct
- getExtension returns the file extension extracted from the original file name and guessExtension returns the extension based on the MIME type.
The choices were
- getExtension returns the extension based on the MIME type and guessExtension returns the file extension extracted from the original file name.
- Only the getExtension method exists in this class.
- getExtension returns the file extension extracted from the original file name and guessExtension returns the extension based on the MIME type.
Help

https://symfony.com/doc/current/controller/upload_file.html

getExtension returns the file extension extracted from the original file name and guessExtension returns the extension based on the MIME type.
HttpClient

Which method call allows to retrieve detailed logs about the requests and the responses of an http transaction ?
Wrong
- getDebugInfo()
The choices were
- getInfoDebug()
- getInfo('debug')
- getDebugInfo()
- getDebug('info')
Help
- https://symfony.com/doc/5.0/components/http_client.html
Functions arguments

Consider the following code snippet:
```
function bake()
{
    $third = ??? ;
    // ...
}
bake('flour', 'spinach', 'egg', 'tomato', 'salt');
```
Which statement does the ??? placeholder replace in order to store the third passed arguments in the $third variable? What are the ways to get the third argument passed to a function?
Correct
- ```
func_get_arg(2)
```
- ```
func_get_args()[2]
```
The choices were
- ```
$_ARGS[2]
```
- ```
func_get_arg(2)
```
- ```
func_get_arg(3)
```
- ```
func_get_args()[2]
```
- ```
$argv[3]
```
Help
- http://php.net/manual/en/function.func-get-arg.php
- http://php.net/manual/en/function.func-get-args.php
func_get_arg(2)PHP func_get_args()[2]PHP
PercentType value storage

What are the valid values of the type option of the Symfony\Component\Form\Extension\Core\Type\PercentType form type.
Correct
- fractional
- integer
The choices were
- raw
- rounded
- integer
- decimal
- fractional
Help

https://symfony.com/doc/2.3/reference/forms/types/percent.html#type

fractional integer
Dependency Injection Tags

What is the tag to use to create a custom form field type?
Correct
- form.type
The choices were
- form.type_extension
- form.type
- form_type
- form
Help

https://symfony.com/doc/2.7/reference/dic_tags.html#form-type

form.type
PHP Config + Symfony

The default value of the realpath_cache_size PHP configuration option is 16K. Is this setting correct for a typical Symfony application?
Wrong
- Yes, because the performance of Symfony applications is independent from that option.
The choices were
- No, it's recommended to decrease it to 4K to limit the I/O load in the server.
- No, it's recommended to increase it at least to 4096K.
- Yes. There is no need to change the default value.
- Yes, because the performance of Symfony applications is independent from that option.
Help

http://symfony.com/doc/current/performance.html

for a typical Symfony application? Wrong Yes, because the performance of Symfony applications is independent from that option.
Twig

Which of the following are valid block names ?
Correct
- foo_bar
- foo123
- _foo
The choices were
- foo123
- _foo
- -foo
- foo_bar
- .foo
- foo.bar
- 123foo
Help
- https://twig.symfony.com/doc/1.x/tags/block.html
foo_bar foo123 _foo
Form

Given the following configuration:
```
$form = $this
      ->createFormBuilder(['myfield' => 'foo'])
      ->add('myfield', TextType::class, ['data' => 'bar', 'empty_data' => 'none'])
      ->getForm();
```
What will be displayed in the myfield field ?
Wrong
- foo
The choices were
- none
- Nothing, an exception will be thrown
- foo
- bar
Help
- https://symfony.com/doc/2.3/reference/forms/types/form.html#data
FindDefinition

What's the difference between findDefinition and getDefinition?
Correct
- findDefinition Resolves aliases
The choices were
- findDefinition doesn't exist
- getDefinition Resolves aliases
- findDefinition Resolves aliases
- There is no difference
Help
- https://symfony.com/doc/current/service_container/definitions.html#getting-and-setting-service-definitions
- https://github.com/symfony/symfony/blob/6da9c5d35b075795d7b0cdc5f09cd92ef0df2fd1/src/Symfony/Component/DependencyInjection/ContainerBuilder.php#L894
findDefinition Resolves aliases
Block class/method overriding

Which keyword is used to block any overriding of a class/method by a subclass?
Correct
- final
The choices were
- protected
- void
- static
- final
- private
Help

http://php.net/manual/en/language.oop5.final.php

final
Array functions

What should you replace /* ??? */ by to get an output of

a = One; b = Two; c = Three
```
<?php
$a = 'somevalue'; 
$array = ['a' => 'One', 'b' => 'Two', 'c' => 'Three'];
/* ??? */
echo "a = $a; b = $b; c = $c";
```
Correct
- extract($array);
The choices were
- asort($array);
- extract($array);
- ksort($array);
- implode($array);
Help
- https://php.net/array
- https://php.net/manual/en/function.extract.php
extract($array);
String

What is the best way to split a string with the -=- pattern?
Correct
- ```
explode("-=-", $string);
```
The choices were
- ```
explode("-=-", $string);
```
- ```
preg_split("-=-", $string);
```
- ```
str_split($string, strpos($string, "-=-"));
```
Help
explode("-=-", $string);PHP
Checking Property Paths

What is the method to call to check if getValue can safely be called?
Wrong
- exists()
The choices were
- checkValue()
- isReadable()
- exists()
- canRead()
Help
- http://symfony.com/doc/current/components/property_access/introduction.html#checking-property-paths
- https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/PropertyAccess/PropertyAccessor.php#L217
Increment operator

Consider the following code snippet:
```
$a = 4;
$b = $a+++$a++;
```
Which of the following is the correct evaluated expression for the $b variable value?
Correct
- ```
$b = 4 + 5;
```
The choices were
- ```
$b = 4 + 5;
```
- ```
$b = 5 + 7;
```
- ```
$b = 5 + 6;
```
- ```
$b = 5 + 5;
```
- ```
$b = 4 + 4;
```
Help
- https://secure.php.net/manual/en/language.operators.increment.php
evaluated expression for the $b variable value? Correct $b = 4 + 5;PHP
Setting cache settings

Which options are available in the Symfony\Component\HttpFoundation\Response::setCache(array $options) method ?
Correct
- etag
- max_age
- private
- public
- last_modified
- s_maxage
The choices were
- not_modified
- last_modified
- public
- expires
- s_maxage
- etag
- max_age
- private
Help
- http://symfony.com/doc/current/http_cache.html#more-response-methods
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/Response.php#L826
etag max_age private public last_modified s_maxage
Control Structures

Which of the following is not a supported control structure keyword in PHP?
Correct
- enddowhile;
The choices were
- endwhile;
- endfor;
- endif;
- endforeach;
- enddowhile;
Help
- https://php.net/manual/en/language.control-structures.php
- https://php.net/manual/en/control-structures.alternative-syntax.php
enddowhile;
Dependency Injection Tags

What is the tag to use to listen to different events/hooks in Symfony?
Wrong
- dispatcher.event_listener
The choices were
- kernel.listener
- kernel.event_listener
- event_listener
- event_dispatcher.event_listener
- dispatcher.event_listener
- dispatcher.listener
Help
- http://symfony.com/doc/current/reference/dic_tags.html#kernel-event-listener
Container

What is the command to display the debug information of the container?
Correct
- debug:container
The choices were
- container:debug
- services:debug
- debug:container
- container:info
- debug:services
Help
- http://symfony.com/doc/current/book/service_container.html#debugging-services
debug:container
Functions

Which of the following are built-in Twig functions (not from the Symfony bridge)?
Wrong
- date()
- dump()
- attribute()
- path()
The choices were
- date()
- render()
- path()
- dump()
- max()
- source()
- url()
- attribute()
Help

https://twig.symfony.com/doc/1.x/functions/index.html#functions
Array functions

What is the output ?
```
<?php
$array1 = ['a', 'b', 'c', 'd', 'e', 'f'];
$array2 = array_slice($array1, -3);
foreach ($array2 as $val) {
    print "$val ";
}
```
Correct
- d e f
The choices were
- c d e
- b c d
- d e f
- a b c
Help
- https://www.php.net/manual/en/language.types.array.php
- https://www.php.net/manual/en/function.array-slice
d e f
Escaping

Which escape strategies are valid for HTML documents ?
Correct
- css
- url
- html_attr
- js
- html
The choices were
- html
- asset
- css
- html_attr
- js
- url
Help

https://twig.symfony.com/doc/1.x/filters/escape.html

css url html_attr js html
FrameworkBundle Configuration

What are the options for configuring the session with cookies in the FrameworkBundle Configuration (framework)?
Correct
- cookie_lifetime
- cookie_httponly
- cookie_domain
- cookie_path
- cookie_secure
The choices were
- force_cookie
- cookie_domain
- cookie_path
- use_cookie
- cookie_secure
- cookie_lifetime
- cookie_httponly
Help
- http://symfony.com/doc/current/reference/configuration/framework.html#session
cookie_lifetime cookie_httponly cookie_domain cookie_path cookie_secure
Dependency Injection Tags

What is the tag to use to register a value resolver for controller arguments such as Request?
Correct
- controller.argument_value_resolver
The choices were
- argument_resolver
- controller.argument_value_resolver
- controller.argument_resolver
- controller.value_resolver
Help

https://symfony.com/doc/3.1/reference/dic_tags.html#controller-argument-value-resolver

controller.argument_value_resolver
Parameter bag

Which of the following parameter bags are not available in the Request object?
Correct
- controller
- response
The choices were
- request
- response
- server
- controller
Help

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Request.php

controller response
Access Decision Manager

Which of the following are built-in voting strategies that can be configured in the AccessDecisionManager object?
Wrong
- consensus
- unanimous
- affirmative
The choices were
- unanimous
- priority
- consensus
- neutral
- positive
- affirmative
- null
- veto
Help

https://symfony.com/doc/5.1/security/voters.html#changing-the-access-decision-strategy
Access Decision Manager

Which of the following is the AccessDecisionManager default strategy?
Wrong
- consensus
The choices were
- affirmative
- consensus
- unanimous
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php#L30
Default validation files directory

What is the default directory to store PHP, YAML or XML validation files (when not using annotations to define constraints)?
Wrong
- config/validations/
The choices were
- config/validator/constraints/
- config/validations/
- constraints/
- validations/
- config/constraints/
- config/packages/validations/
- validator/
- config/validator/
- config/packages/validator/
Help

https://symfony.com/doc/4.x/validation.html#the-basics-of-validation
Configuration

According to the official Symfony Best Practices Guide, where do you need to define the application behavior related configuration options?
Wrong
- config/parameters.yaml
The choices were
- config/parameters.yaml
- .env
- config/parameters.yaml.dist
- .env.dist
- config/services.yaml
Help
- https://symfony.com/doc/4.x/best_practices.html#configuration
- https://symfony.com/doc/4.x/best_practices/configuration.html#application-related-configuration
Expression Language

Which of these ExpressionLanguage methods allow to cache the parsed expression ?
Correct
- compile
- evaluate
- parse
The choices were
- evaluate
- compile
- parse
Help
- https://github.com/symfony/symfony/blob/2.4/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php (parse uses cache, compile and evaluate call parse)
compile evaluate parse
Object inheritance

How to define a class that inherits from Foo ?
Correct
- class Bar extends Foo {}
The choices were
- class Bar inherits Foo {}
- class Bar childof Foo {}
- class Bar extends Foo {}
Help
- https://www.php.net/manual/en/language.oop5.inheritance.php
class Bar extends Foo {}
OptionsResolver usage

When using the OptionsResolver, what is the correct call to setAllowedTypes to allow the value null for the option named my_option ?
Wrong
- ```
$resolver->setAllowedTypes('my_option', [null]);
```
- ```
$resolver->setAllowedTypes('my_option', null);
```
The choices were
- ```
$resolver->setAllowedTypes('my_option', ['null']);
```
- ```
$resolver->setAllowedTypes('my_option', 'null');
```
- ```
$resolver->setAllowedTypes('my_option', [null]);
```
- ```
$resolver->setAllowedTypes('my_option', null);
```
Help
- http://symfony.com/doc/2.6/components/options_resolver.html#type-validation
- https://github.com/symfony/symfony/blob/240e9648af3daa5ed19580fdec74d768e30692a6/src/Symfony/Component/OptionsResolver/OptionsResolver.php#L572
call to setAllowedTypes to allow the value null for the option named my_option ? Wrong $resolver->setAllowedTypes('my_option', [null]);PHP $resolver->setAllowedTypes('my_option', null);PHP

Route debug

Given the following output, which command could be used to format it?

<?xml version="1.0" encoding="UTF-8"?>
<route name="home" class="Symfony\Component\Routing\Route">
    <path regex="{^/(?P&lt;id&gt;[^/]++)?$}sDu">/{id}</path>
    <defaults>
    <default key="id">5</default>
        <default key="_controller">App\Controller\HomeController</default>
    </defaults>
    <options>
      <option key="compiler_class">Symfony\Component\Routing\RouteCompiler</option>
      <option key="utf8">true</option>
    </options>
</route>

bin/console debug:router home --format xml

bin/console router:debug home --format xml

bin/console debug:router home --format xml

bin/console router:match /1 --format xml

bin/console router:format home --format xml

bin/console debug:router home --format xmlBash

Routing

How to get information on the route foobar of an application?
Correct
- ```
bin/console debug:router foobar
```
  Shell
The choices were
- ```
bin/debug.php foobar
```
  Shell
- It is not possible to do this.
- ```
bin/console router:debug foobar
```
  Shell
- ```
bin/check.php foobar
```
  Shell
- ```
bin/console debug:router foobar
```
  Shell
Help
- https://symfony.com/doc/current/routing.html#debugging-routes
bin/console debug:router foobarShell
Debugging environment variables

Which built-in console command can you use to debug the values of environment variables ?
Correct
- bin/console debug:dotenv
The choices were
- bin/console debug:container --parameters
- bin/console debug:container --env
- No built-in command exists to debug environment variables.
- bin/console debug:dotenv
Help
- https://symfony.com/doc/current/configuration.html#listing-environment-variables
- https://symfony.com/blog/new-in-symfony-5-4-misc-features-part-2#new-command-to-debug-environment-variables
bin/console debug:dotenv
Environment variables debug

Given the following output, which command can be used to trigger it?
```
---------------- ----------------- ---------------------------------------------
Name             Default value     Real value
---------------- ----------------- ---------------------------------------------
APP_SECRET       n/a               "471a62e2d601a8952deb186e44186cb3"
FOO              "[1, "2.5", 3]"   n/a
BAR              null              n/a
---------------- ----------------- ---------------------------------------------
```
Bash
Correct
- bin/console debug:container --env-vars
The choices were
- bin/console debug:container --env-vars
- bin/console debug:env
- bin/console debug:container-env
- None
- bin/console debug:container --env-vars-debug
- bin/console debug:container --env-display
Help
- https://symfony.com/doc/4.4/configuration.html#listing-environment-variables
- https://github.com/symfony/symfony/blob/4.4/src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php#L63
bin/console debug:container --env-vars
Accessing Request Data

What will be returned by the following code when the query string is ?foo=bar?
```
$request->query->get('bar', 'baz');
```
Correct
- baz
The choices were
- false
- A Symfony\Component\HttpFoundation\Exception\QueryException will be thrown
- baz
- null
Help
- http://symfony.com/doc/current/components/http_foundation.html#accessing-request-data
baz

Inheritance

All the pages of a website must have a common.css stylesheet. In addition, the homepage needs to have an extra stylesheet home.css. How to achieve that ?

base.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="common.css">
{% endblock %}    
{# ... #}

home.html.twig

{% extends 'base.html.twig' %}
{% block stylesheet %}
    {{ parent() }}
    <link rel="stylesheet" href="home.css">
{% endblock %}    
{# ... #}

base.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="common.css">
{% endblock %}    
{# ... #}

home.html.twig

{% extends 'base.html.twig' %}
{% block stylesheet %}
    {{ parent_block() }}
    <link rel="stylesheet" href="home.css">
{% endblock %}    
{# ... #}

base.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="common.css">
{% endblock %}    
{# ... #}

home.html.twig

{% extends 'base.html.twig' %}
{% block stylesheet %}
    {{ parent('stylesheet') }}
    <link rel="stylesheet" href="home.css">
{% endblock %}    
{# ... #}

base.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="common.css">
{% endblock %}    
{# ... #}

home.html.twig

{% extends 'base.html.twig' %}
{% block stylesheet %}
    {{ parent_block('stylesheet') }}
    <link rel="stylesheet" href="home.css">
{% endblock %}    
{# ... #}

base.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="common.css">
{% endblock %}    
{# ... #}

home.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="home.css">
{% endblock %}    
{# ... #}

base.html.twig

<html>
<head>
{% block stylesheet %}
    <link rel="stylesheet" href="common.css">
{% endblock %}    
{# ... #}

home.html.twig

{% extends 'base.html.twig' %}
{% block stylesheet %}
    {{ parent() }}
    <link rel="stylesheet" href="home.css">
{% endblock %}    
{# ... #}

https://twig.symfony.com/doc/2.x/tags/extends.html

base.html.twig <html> <head> {% block stylesheet %} <link rel="stylesheet" href="common.css"> {% endblock %} {# ... #}Twig home.html.twig {% extends 'base.html.twig' %} {% block stylesheet %} {{ parent() }} <link rel="stylesheet" href="home.css"> {% endblock %} {# ... #}Twig

Form

Given the following form configuration:
```
$form = $this->createFormBuilder()
      ->add('foo', CheckboxType::class, ['value' => 'bar'])
      ->getForm();
```
What will be returned by $form['foo']->getData() when the checkbox is checked and the form submitted ?
Wrong
- bar
The choices were
- bar
- false
- true
- An exception is thrown
Help
- https://symfony.com/doc/2.x/reference/forms/types/form.html
- https://symfony.com/doc/2.x/reference/forms/types/checkbox.html
Password Encoder

According to the official Symfony Best Practices Guide, which encoder do you need to use for encoding your users' passwords?
Correct
- auto
The choices were
- mcrypt
- pbkdf2
- bcrypt
- auto
- plaintext
- sha512
Help

https://symfony.com/doc/4.3/best_practices.html#use-the-auto-password-hasher

auto
Configuration

According to the official Symfony Best Practices Guide, where do you need to define the infrastructure-related configuration options?
Correct
- as environment variables
The choices were
- as environment variables
- config/services.yaml
- config/parameters.yaml
- .env
Help

https://symfony.com/doc/4.0/best_practices/configuration.html#infrastructure-related-configuration

as environment variables
Array functions

Which function is used to remove and return the first element of an array?
Correct
- array_shift
The choices were
- array_grab
- array_pop
- array_pull
- array_shift
Help
array_shift
Array functions

What line should be added to the cleanArray() function below to ensure this script outputs 1525hello?
```
<?php
function cleanArray($arr)
{
    $functions = [];
    /** line **/
    $ret = $arr;
    foreach ($functions as $func) {
        $ret = $func($ret);
    }
    return $ret;
}
$values = [15, '', 0, 25, 'hello', 15];
foreach (cleanArray($values) as $v) {
    echo $v;
}
```
Correct
- array_push($functions, 'array_filter', 'array_unique');
The choices were
- array_push($functions, 'array_reduce');
- array_push($functions, 'array_filter', 'array_unique');
- array_pop($functions, 'array_clean');
- $arr = array_clean($arr);
Help
array_push($functions, 'array_filter', 'array_unique');
Array functions

Which of the following functions compares array1 against array2 and returns the difference by checking array keys in addition?
Wrong
- array_diff_key
The choices were
- array_diff_key
- array_diff_ukey
- array_diff_uassoc
- array_diff_assoc
Help
- https://php.net/array
- https://php.net/manual/en/function.array-diff-assoc.php
Array functions

What is the output?
```
<?php
$array1 = ['a' => 20, 30, 35];
$array2 = ['b' => 20, 35, 30];
$array = array_intersect_assoc($array1, $array2);
var_dump($array);
```
Correct
- array(0) { }
The choices were
- array(1) { ["'a'"]=> int(20)}
- array(0) { }
- array(3) { ["'a'"]=> int(20) [0]=> int(30) [1]=> int(35) }
- An error
Help
- https://php.net/array
- https://php.net/manual/en/function.array-intersect-assoc.php
array(0) { }
Controllers

According to the official Symfony Best Practices Guide, which format do you need to use to configure routing, caching and security whenever possible?
Correct
- annotations/attributes
The choices were
- yaml
- php
- annotations/attributes
- xml
Help

http://symfony.com/doc/current/best_practices/controllers.html

annotations/attributes
Twig operator precedence

In Twig, which of the following operators has the lowest precedence?
Correct
- and
The choices were
- <=
- !=
- ==
- and
Help

https://twig.symfony.com/doc/3.x/templates.html#expressions

and
Operators precedence

In Twig, which of the following operators has the lowest precedence?
Wrong
- and
The choices were
- | (filters)
- and
- ?: (ternary operator)
- ==
- or
Help

https://twig.symfony.com/doc/1.x/templates.html#operators
Form

What is returned by the getData() method of PreSubmitEvent ?
Correct
- an array
The choices were
- an array
- the norm data of the form
- the view data of the form
- The model data of the form
Help
- https://symfony.com/doc/4.3/form/events.html
an array
Access Decision Strategies

What is the default Access Decision Strategy?
Correct
- affirmative
The choices were
- consensus
- priority
- unanimous
- affirmative
Help
- https://symfony.com/doc/current/security/voters.html#changing-the-access-decision-strategy
affirmative
Form Events

Which method should you use to register a new event listener on a FormBuilder instance?
Correct
- addEventListener
The choices were
- addListener
- addEventListener
- createListener
- registerListener
Help
- http://symfony.com/doc/current/components/form/form_events.html
addEventListener
Array functions

What is the output ?
```
<?php
$array = ['a1' => 'x', 'a2' => 'e', 'a3' => 'z'];
asort($array);
foreach ($array as $keys => $values) {
    print "$keys = $values";
}
```
Correct
- a2 = e a1 = x a3 = z
The choices were
- 0 = e 1 =x 2 = z
- An error
- a1 = e a2 = x a3 = z
- a2 = e a1 = x a3 = z
Help

https://www.php.net/manual/fr/function.asort.php

a2 = e a1 = x a3 = z
Form

How is a DateIntervalType form field rendered when the widget option is set to single_text ?
Correct
- a single text field
The choices were
- a single text field
- two html5 date fields
- a single html5 date field
- two text fields
Help
- https://symfony.com/doc/3.2/reference/forms/types/dateinterval.html
a single text field
FrameworkBundle

Given the following esi call: render_esi(url('myroute')), which sentences are true ?
Wrong
- a path must be specified in the framework.fragments option
- myroute must exist
The choices were
- framework.esi must be enabled
- myroute must exist
- a path must be specified in the framework.fragments option
- "url twig function can't be used with render_esi"
Help
- https://symfony.com/doc/2.7/http_cache/esi.html
DateTimeType options
```
$builder  
    ->add('dt', DateTimeType::class, [
        'html5' => false,
        'date_format' => 'yyyy-MM-dd',
        'format' => 'yyyy-MM-dd h:mm:ss',
        'input_format' => 'Ymd H.i.s'
    ])
    // ...  
```
Once the form is submitted, What will be the format of the data passed to the underlying object 'dt' property path (i.e. $form['dt']->getData()) ?
Correct
- a datetime instance
The choices were
- an Ymd H.i.s formatted date string
- a datetime instance
- an yyyy-MM-dd 00:00:00 formatted date string
- an yyyy-MM-dd h:mm:ss formatted date string
Help
- https://symfony.com/doc/4.3/reference/forms/types/datetime.html
a datetime instance
HTTP

When the server can't return an acceptable response according to an If-Match header, it should return:
Correct
- a 412 response code
The choices were
- a 422 response code
- a 418 response code
- a 406 response code
- a 412 response code
Help

https://www.rfc-editor.org/rfc/rfc9110.html#name-preconditions

a 412 response code
HTTP

When the server can't return an acceptable response according to the Accept headers, it should return:
Correct
- a 406 response code
The choices were
- a 418 response code
- a 406 response code
- a 415 response code
- a 412 response code
Help
- https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2
a 406 response code
Security

By default, what is the form field containing the CSRF token?
Correct
- _token
The choices were
- _token
- ThisTokenIsNotSoSecretChangeIt
- _secret
- _csrf
Help
- http://symfony.com/doc/current/security/csrf.html
- http://symfony.com/doc/current/security/csrf.html#csrf-protection-in-symfony-forms
_token
Form login redirection target.

By default, what parameter can you use inside the login form to specify the target of the redirection?
Correct
- _target_path
The choices were
- _default_target
- _target
- _target_path
- _path
- _path_target
Help
- http://symfony.com/doc/current/security/form_login.html#control-the-redirect-url-from-inside-the-form
_target_path
Form

Given the following form type declaration:
```
class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('foo', null)
            ->add('bar', null, ['block_prefix' => 'special_field'])
        ;
    }
}
```
Which of these block names allow to customize these form fields ?
Wrong
- _special_field_widget
- special_field_widget
The choices were
- special_field_widget
- special_field_foo_widget
- _my_form_foo_widget
- _special_field_foo_widget
- _special_field_widget
- my_form_foo_widget
Help
- https://symfony.com/doc/4.3/form/form_themes.html
- https://symfony.com/doc/4.x/form/form_themes.html#custom-fragment-naming-for-individual-fields
Guess locale

What is the attribute in the definition of a route setting the locale of a user?
Correct
- _locale
The choices were
- _controller
- _language
- _i18N
- _locale
Help

http://symfony.com/doc/3.0/book/routing.html#adding-requirements

_locale
Special Routing Parameters

Which attributes are reserved special routing parameters?
Correct
- _controller
- _format
- _locale
The choices were
- _type
- _format
- _locale
- _controller
- _response
Help
- https://symfony.com/doc/2.8/routing.html
_controller _format _locale
Basic functions

Consider the following code snippet:
```
$a = 1;
$b = 0;
????
$c = $a / $b;
```
Which statement does the ???? placeholder replace in order to make this program execute without any errors?
Correct
- ```
__halt_compiler();
```
- ```
die();
```
- ```
exit();
```
The choices were
- ```
abort();
```
- ```
__halt_compiler();
```
- ```
die();
```
- ```
quit();
```
- ```
exit();
```
Help
__halt_compiler();PHP die();PHP exit();PHP
Object Oriented Programming

Which of the following are valid PHP class names ?
Correct
- _MyClass
- myClass
The choices were
- -MyClass
- myClass
- _MyClass
- 123MyClass
Help
- https://www.php.net/manual/en/language.oop5.basic.php
_MyClass myClass
Twig advanced customization

When customizing the twig environment, which of the following class should be used to create a new instanceof test ?

The expected usage is :
```
{% if post is instanceof 'App\Entity\Post' %} ... {% endif %}
```
Twig
Correct
- \Twig\TwigTest
The choices were
- \Twig\TwigFilter
- \Twig\TwigTest
- \Twig\TwigFunction
- No need to customize because it is already built-in.
- \Twig\Token
Help

https://twig.symfony.com/doc/1.x/advanced.html#tests

\Twig\TwigTest
Pluralization interval

Which of the following are not valid interval notations ?
Wrong
- [1,+Inf[
- {0,10,100,1000,Inf}
The choices were
- {0,10,100,1000,Inf}
- ]-Inf,Inf[
- ]1,Inf[
- ]Inf, 0]
- [1,+Inf[
Help
- https://symfony.com/doc/3.4/components/translation/usage.html#explicit-interval-pluralization
- https://en.wikipedia.org/wiki/Interval_(mathematics)#Notations_for_intervals
Filter raw data

Which of the following $options allow a Twig_Filter decide how to escape data by itself?
Wrong
- ```
['is_safe']
```
The choices were
- ```
['is_safe' => ['html']]
```
- ```
['is_safe' => 'html']
```
- ```
['is_safe']
```
- ```
['is_safe' => true]
```
Help

https://twig.symfony.com/doc/2.x/advanced.html#automatic-escaping
Filter raw data

Which of the following $options allow a Twig_Filter decide how to escape data by itself?
Wrong
- ```
['is_safe' => true]
```
The choices were
- ```
['is_safe' => 'html']
```
- ```
['is_safe' => ['html']]
```
- ```
['is_safe' => true]
```
- ```
['is_safe']
```
Help

https://twig.symfony.com/doc/2.x/advanced.html#automatic-escaping
Array functions

Given the $info array defined below, what is the best way to assign the first value to a variable called $name and the third value to a variable called $country?
```
<?php
$info = [
    'Paul',
    31,
    'Australia'
];
```
Wrong
- [$name, $age, $country] = $info;
The choices were
- [$name, , $country] = $info;
- array_list($name, $age, $country) = $info;
- [$name, $age, $country] = $info;
- [$name, $country] = $info;
Help
- https://php.net/array
- https://php.net/manual/en/function.list.php
Query String

Regarding this URI : /example?tags.id=2

What will be the content of $request->query->all() ?
Wrong
- ```
[ 
    'tags' => ['id' => 2] 
]
```
The choices were
- ```
[ 
    'tags' => ['id' => 2] 
]
```
- ```
[ 
    'tags.id' => 2 
]
```
- ```
[ 
    'tags_id' => 2 
]
```
Help
- http://www.php.net/manual/en/language.variables.basics.php
- http://www.php.net/manual/en/language.variables.external.php
Managing status code of controllers made using the TemplateController

The Symfony\Bundle\FrameworkBundle\Controller\TemplateController can be used to render a template without the need to create a dedicated controller. How can you specify the HTTP status code of the response issued by those controllers ?
Correct
- You can use the statusCode option in the route definition like the following :
```
# config/routes.yaml
upload_started:
    path: /upload_started.html
    controller: Symfony\Bundle\FrameworkBundle\Controller\TemplateController
    defaults:
        template:  'file_upload/started.html.twig'
        statusCode: 202 # HTTP Status = Accepted
```
  YAML
The choices were
- You can use the special {_code} route parameter like the following :
```
# config/routes.yaml
upload_started:
    path: /{_code}/upload_started.html
    controller: Symfony\Bundle\FrameworkBundle\Controller\TemplateController
    defaults:
        template:  'file_upload/started.html.twig'
```
  YAML
- You can use the statusCode option in the route definition like the following :
```
# config/routes.yaml
upload_started:
    path: /upload_started.html
    controller: Symfony\Bundle\FrameworkBundle\Controller\TemplateController
    defaults:
        template:  'file_upload/started.html.twig'
        statusCode: 202 # HTTP Status = Accepted
```
  YAML
- You can't.
Help

https://symfony.com/doc/current/templates.html#rendering-a-template-directly-from-a-route https://symfony.com/blog/new-in-symfony-5-4-misc-features-part-2#configurable-status-code-in-templates-rendered-from-routes

You can use the statusCode option in the route definition like the following : # config/routes.yaml upload_started: path: /upload_started.html controller: Symfony\Bundle\FrameworkBundle\Controller\TemplateController defaults: template: 'file_upload/started.html.twig' statusCode: 202 # HTTP Status = AcceptedYAML
PHP Interfaces

Can a class implement multiple interfaces ?
Correct
- Yes.
The choices were
- No.
- Yes.
Help
- https://www.php.net/manual/en/language.oop5.interfaces.php
Yes.
Event

From an Event instance, is it possible to get the EventDispatcher instance that dispatched this event?
Wrong
- Yes.
The choices were
- No.
- Yes.
Help

Since 3.0 the event dispatcher is passed to the listener call. http://symfony.com/doc/current/components/event_dispatcher.html#event-name-introspection
Debug translation

It is possible to find missing or unused translation messages from templates?
Correct
- Yes, with the debug:translation command
The choices were
- Yes, with the debug:translate command
- Yes, with the debug:translator command
- Yes, with the debug:i18n command
- Yes, with the debug:translation command
- No, it is not possible.
Help

https://symfony.com/doc/2.7/translation/debug.html

Yes, with the debug:translation command
POSIX Signal

When you are running a program asynchronously, it is possible to send it POSIX signals ?
Correct
- Yes, with the Symfony\Component\Process\Process::signal method
The choices were
- Yes, with the Symfony\Component\Process\Process::signal method
- No, it's not possible.
- Yes, with the Symfony\Component\Process\Process::sendSignal method
- Yes, with the Symfony\Component\Process\Process::send method
Help
- https://symfony.com/doc/2.3/components/process.html#process-signals
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Process/Process.php#L347
Yes, with the Symfony\Component\Process\Process::signal method
CollectionType usage

Could empty CollectionType entries be removed?
Correct
- Yes, using delete_empty option
The choices were
- Yes, using resize_when_empty option
- The CollectionType automatically resize itself
- It's not possible
- Yes, using delete_empty option
- Yes, using remove_empty option
Help

https://symfony.com/doc/2.5/reference/forms/types/collection.html#delete-empty

Yes, using delete_empty option
Autowiring (interfaces)

Is it possible to autowire the following service?

Let's assume that HtmlTransformer implements TransformerInterface:
```
services:
    transformer_html:
        class:    Acme\HtmlTransformer
    twitter_client:
        class:    Acme\TwitterClient
        autowire: true
```
YAML
```
class TwitterClient
{
    private $transformer;
    public function __construct(TransformerInterface $transformer)
    {
        $this->transformer = $transformer;
    }
    public function tweet($user, $key, $status)
    {
        $transformedStatus = $this->transformer->transform($status);
        // ... connect to Twitter and send the encoded status
    }
}
```
Correct
- Yes, the autowiring mechanism is smart enough to detect a service definition which implements the TransformerInterface
The choices were
- No, the autowiring mechanism doesn't work with interfaces
- Yes, the autowiring mechanism is smart enough to detect a service definition which implements the TransformerInterface
Help

https://symfony.com/doc/current/components/dependency_injection/autowiring.html#working-with-interfaces

Yes, the autowiring mechanism is smart enough to detect a service definition which implements the TransformerInterface
Constants

Is it possible to use a constant in a parameter?
Correct
- Yes, in PHP
- Yes, in the YAML format (thanks to the expression language component)
- Yes in XML format
The choices were
- Yes in XML format
- Yes, in PHP
- No
- Yes, in the YAML format (thanks to the expression language component)
Help

https://symfony.com/doc/2.7/service_container/parameters.html#constants-as-parameters

Yes, in PHP Yes, in the YAML format (thanks to the expression language component) Yes in XML format
Twig template

Does this syntax perform any check?
```
{{ foo['bar'] }}
```
Twig
Wrong
- Yes, if foo is an object then if it's an array
The choices were
- No
- Yes if foo is an array
- Yes, if foo is an object then if it's an array
Help

https://twig.symfony.com/doc/1.x/templates.html#variables
PSR-18 usage

It is possible to use PSR-18 for your requests?
Correct
- Yes, by using Symfony\Component\HttpClient\Psr18Client
The choices were
- Yes, by using Symfony\Component\HttpClient\Psr18Client
- No
Help
- https://symfony.com/doc/5.0/http_client.html#psr-18-and-psr-17
- https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/HttpClient/Psr18Client.php
Yes, by using Symfony\Component\HttpClient\Psr18Client
Testing

Is it possible to simulate an HTTP request without mocking the HttpClient thanks to createMock() from PHPUnit?
Correct
- Yes, by using Symfony\Component\HttpClient\MockHttpClient
The choices were
- Yes, by using Symfony\Component\HttpClient\MockHttpClient
- No
Help
- https://symfony.com/doc/current/components/http_client.html#testing-http-clients-and-responses
- https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpClient/MockHttpClient.php
Yes, by using Symfony\Component\HttpClient\MockHttpClient
Default user provider.

When using several user providers in your application, is it mandatory to define the provider key on your firewall(s) configuration ?
Correct
- Yes, but it is not mandatory when there is only one provider.
The choices were
- No, if the value is not set, the first defined provider will be used.
- Yes, if the value is not set on one of the firewalls, an error will be thrown.
- Yes, but it is not mandatory when there is only one provider.
- No, if the value is not set, the last defined provider will be used.
Help
- https://symfony.com/doc/4.0/security/multiple_user_providers.html
- https://github.com/symfony/symfony/blob/v4.0.0/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php#L246
Yes, but it is not mandatory when there is only one provider.
Autowiring

Will Autowiring automatically inject dependencies of an autowired service?
Wrong
- Yes, autowiring will find and register all dependencies
The choices were
- Yes, autowiring will find and register all dependencies
- Yes, if dependencies are explicitly declared as autowired or manually configured.
- No
Help

https://symfony.com/doc/2.8/service_container/autowiring.html
Stubs

When creating stub is it possible to disable the call to the original class constructor?
Correct
- Yes with the disableOriginalConstructor() method.
The choices were
- No
- Yes with the disableOriginalConstruct() method.
- Yes with the disableOriginalConstructor() method.
- Yes with the disableConstruct() method.
- Yes with the disableConstructor() method.
Help

https://phpunit.de/manual/5.7/en/test-doubles.html#test-doubles.stubs

Yes with the disableOriginalConstructor() method.
ImmutableEventDispatcher usage

Could an event be dispatched from the ImmutableEventDispatcher?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

Yes
TemplateController usage

Could a status code be defined when rendering a template using TemplateController?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/blog/new-in-symfony-5-4-misc-features-part-2#configurable-status-code-in-templates-rendered-from-routes
- https://github.com/symfony/symfony/pull/41414
Yes
Validator cache

Could the cache service used to store validation metadata be overridden?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/2.3/reference/configuration/framework.html#validation

Yes
Closure execution

Could a Closure be executed?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Runtime/Runner/ClosureRunner.php

Yes
Expressions evaluation

Could the parsed and/or serialized expressions be evaluated?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.4/components/expression_language/caching.html#using-parsed-and-serialized-expressions

Yes
Moved permanently usage

Should a Location header be set in a response that use the 301 status code?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://datatracker.ietf.org/doc/html/rfc7231#section-6.4.2
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/301
Yes

Event aliases

Is the following code valid?

<?php
namespace App;
use App\Event\MyCustomEvent;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\EventDispatcher\DependencyInjection\AddEventAliasesPass;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;
class Kernel extends BaseKernel
{
  protected function build(ContainerBuilder $container)
  {
    $container->addCompilerPass(new AddEventAliasesPass([
      MyCustomEvent::class => 'my_custom_event',
    ]));
  }
}

https://symfony.com/doc/4.4/event_dispatcher.html#event-aliases

Yes

ImmutableEventDispatcher usage

Could the existence of an event listener be checked from within the ImmutableEventDispatcher?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

Yes
ExpressionLanguage usage

Could an Expression be created from within a template?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.4/reference/twig_reference.html#functions

Yes
Event aliases

Could the alias of an event be changed?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.4/event_dispatcher.html#event-aliases

Yes
Render the rest of the fields

Is there a way to make sure that the {{ form_end(form) }} does not render all the fields not rendered?
Correct
- Yes
The choices were
- No
- Yes
Help
- http://symfony.com/doc/current/reference/forms/twig_reference.html#form-end-view-variables
Yes
Number constraint

Is it possible to check that a number is positive?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.3/reference/constraints/Positive.html

Yes
Middleware usage

Could the default middleware list be disabled?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.1/messenger.html#disabling-default-middleware

Yes
Variables

Is it possible to pass PHP objects to a Twig template?
Correct
- Yes
The choices were
- Yes
- No
Help
- http://twig.symfony.com/doc/templates.html#variables
Yes
Translation

Is it possible to activate an option to log missing translations?
Correct
- Yes
The choices were
- Yes
- No
Help
- http://symfony.com/doc/current/reference/configuration/framework.html#logging
Yes
Worker informations

Could information like the transport name and so on can be retrieved from the worker?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/blog/new-in-symfony-5-4-messenger-improvements#worker-metadata
- https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Messenger/WorkerMetadata.php
Yes

Groups sequence

Is the following code valid?

<?php
namespace App\Entity;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Validator\Constraints as Assert;
#[Assert\GroupSequence(['User', 'Strict'])]
class User implements UserInterface
{
  #[Assert\NotBlank]
  private $username;
  #[Assert\NotBlank]
  private $password;
  #[Assert\IsTrue(
    message: 'The password cannot match your username',
    groups: ['Strict'],
  )]
  public function isPasswordSafe(): bool
  {
    return ($this->username !== $this->password);
  }
  // ...
}

Yes

Multiple buses

Can you have multiple buses in a single application?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.4/messenger/multiple_buses.html

Yes
Attributes usage

Should attributes be used to define entities mapping?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.4/best_practices.html#use-attributes-to-define-the-doctrine-entity-mapping

Yes
Container dump

Could the container be dumped into a single file?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/4.4/performance.html#dump-the-service-container-into-a-single-file
- https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php#L117
Yes
Writing to Arrays

Is it possible to set values of an array with a PropertyAccessor?
Correct
- Yes
The choices were
- No
- Yes
Help
- http://symfony.com/doc/current/components/property_access/introduction.html#writing-to-arrays
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/PropertyAccess/PropertyAccessor.php#L142
Yes
Immutable response

Given the context where a file (called react.0.0.0.js and incremented each time the file is updated) is available via https://example.com/react.0.0.0.js, could an immutable cache-control header be applied to it without encountering any cache issues?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://datatracker.ietf.org/doc/html/rfc8246
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
Yes
ParameterBag usage

Could a ParameterBag be frozen?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php

Yes
Configuration files import

Is the following code valid?
```
# config/services.yaml
imports:
  - { resource: 'my_config_file.xml', ignore_errors: not_found }
# ...
```
YAML
Correct
- Yes
The choices were
- Yes
- No
Help
- https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php#L48
- https://symfony.com/doc/4.4/configuration.html#importing-configuration-files
Yes
Secrets usage

Should secrets be used to store sensitive configuration values (like an API key)?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.4/best_practices.html#use-secret-for-sensitive-information

Yes
Interoperability

Can I use Twig without using Symfony?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://twig.symfony.com/
- https://github.com/twigphp/Twig
Yes
Enumerations usage

Could enumerations be used with !php/const?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/pull/40857

Yes
Loading routes

Is it possible to load routes from a file?
Correct
- Yes
The choices were
- No
- Yes
Help

http://symfony.com/doc/3.0/components/routing/introduction.html#load-routes-from-a-file

Yes
Synthetic services

Could synthetic services be injected into other services?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.7/service_container/synthetic_services.html

Yes
Stateless route

Could the usage of the session be deactivated per route?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.1/routing.html#stateless-routes

Yes
FlashBag usage

Could a FlashBag be cleared?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php

Yes
LanguageType

Could the choices of LanguageType be overridden?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/2.0/reference/forms/types/language.html#choices

Yes
Safe usage

Is the following code valid when using the safe directive?
```
GET /foo.html HTTP/1.1
Host: www.example.org
User-Agent: ExampleBrowser/1.0
Prefer: safe
```
Plain text
Correct
- Yes
The choices were
- No
- Yes
Help

https://datatracker.ietf.org/doc/html/rfc8674#section-2

Yes
Parsing

Is the following code valid?
```
<?php
use Symfony\Component\Yaml\Yaml;
$value = Yaml::parse(file_get_contents('/path/to/file.yml'));
```
Correct
- Yes
The choices were
- No
- Yes
Help
- http://symfony.com/doc/current/components/yaml/introduction.html#reading-yaml-files
Yes
EventListener registration

Could an event listener be registered while using the __invoke() method to listen to an event?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.1/event_dispatcher.html#creating-an-event-listener

Yes

PHP - Create an instance

Does the following code valid ?

<?php
class ClassA extends \stdClass {}
class ClassB extends \stdClass {}
class ClassC extends ClassB {}
class ClassD extends ClassA {}
function getSomeClass(): string
{
    return 'ClassA';
}
var_dump(new (getSomeClass()));
var_dump(new ('Class' . 'B'));
var_dump(new ('Class' . 'C'));
var_dump(new (ClassD::class));

Yes

Twig

Is the following extends tag valid ?
```
{% extends ['layout1.html.twig', 'layout2.html.twig'] %}
```
Correct
- Yes
The choices were
- Yes
- No
Help

https://twig.symfony.com/doc/1.x/tags/extends.html#dynamic-inheritance

Yes
Mirror usage

When using mirror(...), could files that are not present in the source directory be deleted?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.2/components/filesystem.html#mirror
- https://github.com/symfony/symfony/blob/2.2/src/Symfony/Component/Filesystem/Filesystem.php#L338
Yes

Auto_alias usage

Is the following code valid?

<?php
use AppBundle\Lock\MysqlLock;
use AppBundle\Lock\PostgresqlLock;
use AppBundle\Lock\SqliteLock;
// Given $container is an instance of ContainerBuilder
$container->register('app.mysql_lock', MysqlLock::class)->setPublic(false);
$container->register('app.postgresql_lock', PostgresqlLock::class)->setPublic(false);
$container->register('app.sqlite_lock', SqliteLock::class)->setPublic(false);
$container->register('app.lock')->addTag('auto_alias', [
  'format' => 'app.%database_type%_lock',
]);

Yes

Safe method

Could a cache performance optimization (such as pre-fetching) be used with a safe method?
Correct
- Yes
The choices were
- Yes
- No
Help

https://tools.ietf.org/html/rfc7231#section-4.2.1

Yes
Route lifecycle

Could a route be aliased?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/blog/new-in-symfony-5-4-route-aliasing
- https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Routing/Alias.php
Yes
Color constraint

Could a RGB color be validated?
Correct
- Yes
The choices were
- Yes
- No
Help
Yes
Customization

Could the destination of the dump be customized?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.1/components/var_dumper.html#the-dump-server

Yes
Number constraint

Is it possible to check that a number is positive or equal to zero?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.3/reference/constraints/PositiveOrZero.html

Yes
ContainerBuilder usage

Could the number of time each environment variables has been resolved be obtained when using ContainerBuilder?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/DependencyInjection/ContainerBuilder.php#L1077

Yes
Services preload

Could a class be added into the list of preloaded classes by PHP?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.1/reference/dic_tags.html#container-preload

Yes
Immutable response

Could an immutable cache-control header be used with max-age?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://datatracker.ietf.org/doc/html/rfc8246
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
Yes
Customization

Could the theme used by HtmlDumper be changed?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/4.2/components/var_dumper/advanced.html#dumpers
- https://github.com/symfony/symfony/blob/4.2/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php#L97
Yes
Location header

Does a response using the 308 status code should contain a Location header?
Correct
- Yes
The choices were
- No
- Yes
Help

https://tools.ietf.org/html/rfc7538#section-3

Yes
Session usage

Could the session be migrated?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/HttpFoundation/Session/Session.php#L171

Yes
RequestMatcher usage

Could a custom request matcher be created?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/HttpFoundation/RequestMatcherInterface.php

Yes
RequestStack usage

Could the parent request be retrieved from the request stack?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.4/src/Symfony/Component/HttpFoundation/RequestStack.php

Yes
Events debug

Is the following code valid?
```
php bin/console debug:event-dispatcher Security
```
Bash
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.3/event_dispatcher.html#debugging-event-listeners

Yes
Validation Groups

If a User class extends a BaseUser class, and the applied validation group is User. Will the constraints present in the BaseUser class be applied ?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/current/validation/sequence_provider.html
- https://symfony.com/doc/current/validation/groups.html
Yes
Fragment renderer

Could a custom fragment renderer strategy be created?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/2.2/reference/dic_tags.html#kernel-fragment-renderer
- https://github.com/symfony/symfony/blob/2.2/src/Symfony/Component/HttpKernel/Fragment/FragmentRendererInterface.php
Yes
Server-sent events

Could you consume server-sent events?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.2/http_client.html#consuming-server-sent-events

Yes
Custom tags parsing

Is the following code valid?
```
<?php
// ...
$parsed = Yaml::parse("!custom_tag { foo: bar }", Yaml::PARSE_CUSTOM_TAGS);
```
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/3.4/components/yaml.html#parsing-and-dumping-custom-tags
- https://github.com/symfony/symfony/blob/3.3/src/Symfony/Component/Yaml/Yaml.php#L32
Yes
Events debug

Is the following code valid?
```
php bin/console debug:event-dispatcher kernel
```
Bash
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.3/event_dispatcher.html#debugging-event-listeners

Yes
Environment variables override

Is it possible to define environment variables only for the test environment?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#using-options

Yes
Stale response

Could a stale response be marked as reusable when an origin server responds with and error (500, 502, 503 or 504)?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://datatracker.ietf.org/doc/html/rfc5861#section-4
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
Yes
Environment variables usage

Is the following code valid?
```
# config/packages/framework.yaml
framework:
  router:
    http_port: '%env(int:HTTP_PORT)%'
```
YAML
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.2/configuration/env_var_processors.html

Yes
Locale

Is it possible to change directly the locale of a Request from an URL?
Correct
- Yes
The choices were
- No
- Yes
Help
- http://symfony.com/doc/current/book/routing.html#adding-requirements
Yes
Escaping

Can we create a custom escaper for Twig ?
Correct
- Yes
The choices were
- No
- Yes
Help

https://twig.symfony.com/doc/1.x/filters/escape.html#custom-escapers

Yes
Symfony Vault

Should the Symfony secret vault be used in a critical production environment?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.4/configuration/secrets.html

Yes
Cache usage in templates

Is the following code valid?
```
{% cache '_foo_template' %}
    Cached forever (depending on the cache implementation)
{% endcache %}
```
Twig
Correct
- Yes
The choices were
- No
- Yes
Help

https://twig.symfony.com/doc/3.x/tags/cache.html

Yes
ImmutableEventDispatcher usage

Could the event listeners related to an event be retrieved from the ImmutableEventDispatcher?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

Yes

Custom request matcher usage

Is the following code valid?

# config/packages/security.yaml
security:
# ...
    firewalls:
        secured_area:
            request_matcher: app.firewall.secured_area.request_matcher
            # ...

https://symfony.com/doc/4.2/security/firewall_restriction.html#restricting-by-service

Yes

Container preloading

Could the container be preloaded using Opcache preloading?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.4/performance.html#use-the-opcache-class-preloading

Yes
Definition visibility

When creating a service definition using PHP, could the visibility of the service be changed using Symfony\Component\DependencyInjection\Definition::setPublic($boolean) ?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/Definition.php#L527

Yes
Configuration

Is it possible to set the path used to load the .env files?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#using-options

Yes
Method forwards

Could the number of forwards be limited in a TRACE or OPTIONS request?
Correct
- Yes
The choices were
- No
- Yes
Help

https://tools.ietf.org/html/rfc7231#section-5.1.2

Yes
Signals

Could a command listen to signals?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.3/components/console/events.html#the-consoleevents-signal-event

Yes
Extract usage

Could existing variables be overwritten when using extract?
Correct
- Yes
The choices were
- Yes
- No
Help

https://www.php.net/manual/en/function.extract.php

Yes
Controller

Is it possible to pass a Response instance to the Symfony\Bundle\FrameworkBundle\Controller\Controller::render() method?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://github.com/symfony/symfony/blob/3.1/src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php#L209
Yes
Symfony internal events

Could the FQCN of a Symfony built-in event be used to subscribe / listen to it?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.4/event_dispatcher.html#event-aliases

Yes
Fields priority

Could fields be sorted using a priority?
Correct
- Yes
The choices were
- Yes
- No
Help
- Since 5.3, the priority option can be used to sort fields.
- https://symfony.com/blog/new-in-symfony-5-3-form-field-sorting
- https://github.com/symfony/symfony/pull/40690
Yes
Signals handling

Is it possible to listen signals and stop command according to them?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/blog/new-in-symfony-5-2-console-signals

Yes
RequestContext configuration

Could the scheme used by the RequestContext be overridden via a parameter?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/2.2/src/Symfony/Bundle/FrameworkBundle/Resources/config/routing.xml#L27
- https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/Routing/RequestContext.php#L76
Yes
Serializer customization

Could the default serializer be changed?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/blog/new-in-symfony-5-4-serializer-improvements#custom-serializer-for-symfony-messenger
- https://github.com/symfony/symfony/pull/42257
Yes
Extract usage

Could variables be extracted as references when using extract?
Correct
- Yes
The choices were
- No
- Yes
Help

https://www.php.net/manual/en/function.extract.php

Yes
JSONP usage

Could a JSONP callback be set?
Correct
- Yes
The choices were
- No
- Yes
Help
Yes
Environment variables usage

Is the following code valid?
```
# config/packages/framework.yaml
parameters:
  env(AUTH_FILE): '../config/auth.json'
google:
  auth: '%env(file:AUTH_FILE)%'
```
YAML
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.2/configuration/env_var_processors.html#built-in-environment-variable-processors

Yes
Compiler Passes

Could a priority be set when adding a new compiler pass?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/4.1/components/dependency_injection/compilation.html#controlling-the-pass-ordering
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php#L113
Yes
CIDR validation

Could a CIDR notation be validated?
Correct
- Yes
The choices were
- No
- Yes
Help
Yes
Must-understand fallback

Should the must-understand directive be coupled with no-store for fallback behavior?
Correct
- Yes
The choices were
- No
- Yes
Help

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#directives

Yes
Moved permanently usage

Could a response that use the 301 status code be cached?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://datatracker.ietf.org/doc/html/rfc7231#section-6.4.2
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/301
Yes
Functional Tests

According to the official Symfony Best Practices Guide, is it useful to spend time and effort writing tests that check if your application pages are successfully loading?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/current/best_practices.html#tests
Yes
HTTP headers value

Are the "HTTP-date" directives considered as case-sensitive?
Correct
- Yes
The choices were
- No
- Yes
Help

https://datatracker.ietf.org/doc/html/rfc7231#section-7.1.1.1

Yes
Question usage

Could a response to a question be hidden?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/2.5/components/console/helpers/questionhelper.html#hiding-the-user-s-response

Yes
Expires usage

Is the following header value valid?
```
Expires: Sun, 06 Nov 1994 08:49:37 GMT
```
Plain text
Correct
- Yes
The choices were
- No
- Yes
Help
Yes
Command usage

Could Command be used as a concrete class without defining the execute method?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Console/Command/Command.php#L145
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Console/Command/Command.php#L194
Yes
Asset package

Could an custom asset package be added?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/reference/dic_tags.html#assets-package

Yes
Interfaces

Can interfaces define constants in PHP?
Correct
- Yes
The choices were
- Yes
- No
Help
- http://php.net/interfaces
Yes
Options deprecation by-pass

Is it possible to bypass a deprecation message triggered by the use of a deprecated option?
Correct
- Yes
The choices were
- Only when running tests
- Yes
- No
Help

https://symfony.com/doc/current/components/options_resolver.html#deprecating-the-option

Yes
Extract usage

Could extracted variables be prefixed when using extract?
Correct
- Yes
The choices were
- No
- Yes
Help

https://www.php.net/manual/en/function.extract.php

Yes
ContainerConfigurator usage

Could a closure be defined as a service reference using ContainerConfigurator?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/dependency-injection/blob/5.4/Loader/Configurator/ContainerConfigurator.php#L206

Yes
Configuration

Is it possible to define environment variables only for the prod environment?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#using-options

Yes
511 authentication

Should a response using the 511 status code contains a link to a resource that allows the client to authenticate itself?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://datatracker.ietf.org/doc/html/rfc6585#section-6
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/511
Yes
Security events debug

Is the following code valid?
```
php bin/console debug:event-dispatcher --dispatcher=security.event_dispatcher.main
```
Bash
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/event_dispatcher.html#debugging-event-listeners

Yes
Process timeout

Is it possible to limit the amount of time a process takes to complete?
Correct
- Yes
The choices were
- Yes
- No
Help
- http://symfony.com/doc/current/components/process.html#process-timeout
Yes
FlashBag usage

Could the FlashBag messages be retrieving while being removed from the bag?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/fc0a09a2052e9275c16b5ab7af426935fe432f39/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php#L162

Yes
Abstract services

Should a parent service be declared as abstract if no class is set in its service definition?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.7/service_container/parent_services.html

Yes
Response

Could you emulate chunked responses and/or timeouts in mocked responses?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.2/http_client.html#testing-http-clients-and-responses

Yes
Immutable directive

Should a resource marked as immutable be validated again when considered stale?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://datatracker.ietf.org/doc/html/rfc8246
- https://datatracker.ietf.org/doc/html/rfc8246#section-2
Yes

HttpFoundation integration

Is the following code valid?

use Symfony\Component\HttpFoundation\Response;
require_once dirname(__DIR__).'/vendor/autoload_runtime.php';
return function (): Response {
    return new Response('Hello world');
};

https://symfony.com/doc/5.3/components/runtime.html#using-the-runtime

Yes

Assets usage

Could an exception be thrown in case of a missing asset?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/blog/new-in-symfony-5-4-misc-features-part-1#strict-mode-for-missing-assets
- https://github.com/symfony/symfony/pull/38495
Yes
TraceableEventDispatcher usage

Could the non-called listeners be retrieved per event when using the TraceableEventDispatcher?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.5/components/event_dispatcher/traceable_dispatcher.html
- https://github.com/symfony/symfony/blob/2.5/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
Yes
Finder usage

Is there any way to check if the Finder contains any results?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/3.4/src/Symfony/Component/Finder/Finder.php#L618

Yes

Autowiring

Will the following autowiring declaration work?

services:
    rot13:
        class:    Acme\Transformer\Rot13Transformer
        arguments: [true]
    rot13_2:
        class:    Acme\Transformer\Rot13Transformer
        arguments: [false]
    twitter_client:
        class:    Acme\TwitterClient
        autowire: true

namespace Acme;
use Acme\Transformer\Rot13Transformer;
class TwitterClient
{
    private $transformer;
    public function __construct(Rot13Transformer $transformer)
    {
        $this->transformer = $transformer;
    }
    public function tweet($user, $key, $status)
    {
        $transformedStatus = $this->transformer->transform($status);
        // ... connect to Twitter and send the encoded status
    }
}

https://symfony.com/doc/current/components/dependency_injection/autowiring.html

Constraints debug

Could the constraints of a class be listed?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.2/validation.html#debugging-the-constraints

Yes

Synthetic services

Is the following code valid when registering a synthetic service?

// config/services.php
namespace Symfony\Component\DependencyInjection\Loader\Configurator;
return function(ContainerConfigurator $configurator) {
    $services = $configurator->services();
    $services->set('app.synthetic_service')
        ->synthetic();
};

https://symfony.com/doc/5.0/service_container/synthetic_services.html

Yes

new Authenticator-Based Security

In the Authenticator-Based Security, Is it possible to create a custom entry_point ?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.1/security/experimental_authenticators.html#configuring-the-authentication-entry-point

Yes

PSR-7 usage

Is the following code valid?

<?php
// ...
use Psr\Http\Message\RequestInterface;
class HomeController
{
    #[Route('/', name: 'home')]
    public function __invoke(RequestInterface $session): Response
    {
      // ...
    }
}

https://github.com/sensiolabs/SensioFrameworkExtraBundle/blob/3.0/Request/ParamConverter/PsrServerRequestParamConverter.php

Yes

Mirror usage

Is the following code valid?
```
<?php
# ...
$fs = new Filesystem();
$fs->mirror('/srv/app', '/srv/bar', null, ['copy_on_windows' => true]);
```
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/2.1/components/filesystem.html#mirror
- https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/Filesystem/Filesystem.php#L338
Yes
Cursor usage

Could the Cursor be hidden?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.2/components/console/helpers/cursor.html#using-the-cursor

Yes
AbstractSessionListener usage

Could the AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER header directive be used on sub-requests?
Wrong
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/4.1/http_cache.html#http-caching-and-user-sessions
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php#L68
FlashBag service usage

Could the session.flash_bag service be used?
Wrong
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/5.4/UPGRADE-6.0.md#frameworkbundle
Security events debug

Could the listeners be debugged per firewall?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/event_dispatcher.html#debugging-event-listeners

Yes
Check_path

When configuring the main firewall of an application, could its check_path route be covered by another firewall ?
Wrong
- Yes
The choices were
- No
- Yes
Help

http://symfony.com/doc/current/reference/configuration/security.html#check-path

Form Handling

Can this form (with default configuration) be submitted ?

class FooController extends AbstractController
{
    #[Route('/foo', name: 'foo', methods: ['GET'])]
    public function foo(Request $request)
    {
        $form = $this->createForm(FooType::class);
        $form->handleRequest($request);
        if ($form->isSubmitted() && $form->isValid()) {
            // ...
        }
    }
}

https://symfony.com/doc/current/forms.html#rendering-forms

Decorating services

Could the priority of a decorating service be defined?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/2.8/service_container/service_decoration.html#decoration-priority

Yes
Handlers

Could HttpKernelRunner handle terminable kernel?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Runtime/Runner/Symfony/HttpKernelRunner.php
Yes
Usage

Can an Email instance be serialized?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/4.3/components/mime.html#serializing-email-messages
Yes
Serialization Context

Is it possible to specify the serialization context in an attribute/annotation?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/blog/new-in-symfony-5-3-inlined-serialization-context

Yes
Configuration

Could the ConsoleApplicationRunner be executed without setting an environment?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Runtime/Runner/Symfony/ConsoleApplicationRunner.php

Yes
ContainerConfigurator usage

Could an Expression be configured using ContainerConfigurator?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/dependency-injection/blob/3.4/Loader/Configurator/ContainerConfigurator.php#L125

Yes
Fields mapping

Could values be mapped to fields using callbacks?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.2/form/data_mappers.html#mapping-form-fields-using-callbacks

Yes
Container configuration

Given the context where the container build time must be configured, is the following code valid?
```
# app/config/services.yml
parameters:
    # ...
    kernel.container_build_time: '1645176920'
# ...
```
YAML
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/3.4/reference/configuration/kernel.html#container-build-time

Yes
Parser configuration

Could the parser cache be changed?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/2.4/components/expression_language/caching.html#the-workflow

Yes
Firewall

Is it possible to have more than one firewall in your application?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/2.3/reference/configuration/security.html

Yes
If-Match usage

Could the If-Match etag be transformed to a weak one?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Match#syntax
Yes
Environment configuration

Could templates be configured to exclusively use yield instead of echo?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/twigphp/Twig/blob/v3.9.0/src/Environment.php#L104

Yes
Security usage

Could the current token be retrieved from Symfony\Component\Security\Core\Security?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/3.4/security.html#securing-other-services
- https://github.com/symfony/symfony/blob/3.4/src/Symfony/Component/Security/Core/Security.php
Yes
Performances improvement

Could normalizers / denormalizers be cached to improve performances?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/4.1/components/serializer.html#performance
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/Serializer/Normalizer/CacheableSupportsMethodInterface.php
Yes
Environment variables usage

Is the following code valid?
```
# config/services.yaml
parameters:
  env(SECRETS_FILE): '/opt/application/.secrets.json'
  database_password: '%env(key:database_password:json:file:SECRETS_FILE)%'
```
YAML
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.2/configuration/env_var_processors.html#built-in-environment-variable-processors

Yes
Session

Can PHP sessions work without cookies?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://www.php.net/manual/en/session.idpassing.php
Yes
AST usage

Could the AST be dumped?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/3.2/components/expression_language/ast.html#dumping-the-ast

Yes

new Authenticator-based Security

is the following code valid :

# config/packages/security.yaml
security:
    enable_authenticator_manager: true
    # ...
    firewalls:
        main:
            # allow authentication using a form or HTTP basic
            form_login: ~
            http_basic: ~
            # App\Security\CustomEntryPoint is a custom entry point implementing Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface
            entry_point: App\Security\CustomEntryPoint

https://symfony.com/doc/current/security/authenticator_manager.html#configuring-the-authentication-entry-point

Yes

format_datetime usage

When using format_datetime(), could the calendar be changed?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://twig.symfony.com/doc/2.x/filters/format_datetime.html
- https://twig.symfony.com/doc/2.x/filters/format_datetime.html#arguments
Yes
Default value

Is it possible to define default values that depend on another option?
Correct
- Yes
The choices were
- Yes
- No
Help
- http://symfony.com/doc/current/components/options_resolver.html#default-values-that-depend-on-another-option
Yes
Public service

Is it possible to create a service that is not publicly accessible?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.8/service_container/alias_private.html#marking-services-as-public-private

Yes
Cache requirements

Could a resource be stored only if the cache understand the requirements to store the response?
Correct
- Yes
The choices were
- Yes
- No
Help

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#directives

Yes
Multiple transports

Can you configure multiple transports to ensure that emails are sent even if one mailer server fails?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/6.0/mailer#high-availability

Yes
TraceableEventDispatcher usage

Could the called listeners be retrieved per event when using the TraceableEventDispatcher?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.5/components/event_dispatcher/traceable_dispatcher.html
- https://github.com/symfony/symfony/blob/2.5/src/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
Yes
LanguageType

Is setting the choice_loader to null required when overriding the choices of LanguageType?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/3.3/reference/forms/types/language.html#choices

Yes
ParameterBag usage

Is the following code valid?
```
<?php
use Symfony\Component\DependencyInjection\ParameterBag;
$bag = new ParameterBag();
$bag->append('foo', 'bar');
```
Wrong
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/ParameterBag/ParameterBag.php
RequestStack usage

Given the context where a single request is stored in the RequestStack, could the current request be removed from the request stack?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.4/src/Symfony/Component/HttpFoundation/RequestStack.php

Yes
Route attributes

It is possible to specify a default value for an attribute in a route?
Correct
- Yes
The choices were
- No
- Yes
Help
- http://symfony.com/doc/current/create_framework/routing.html
- http://symfony.com/doc/current/routing.html#giving-placeholders-a-default-value
Yes
Use usage

Could multiple use be used in a single template?
Correct
- Yes
The choices were
- Yes
- No
Help

https://twig.symfony.com/doc/1.x/tags/use.html

Yes
Cursor usage

Could the output be cleaned using the Cursor?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/5.2/components/console/helpers/cursor.html#clearing-output

Yes
Locked command

Could you prevent a command from running multiple times on a single server?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/3.2/console/lockable_trait.html

Yes
PHP constant

Is it possible to display the value of a constant of a PHP class in a Twig template ?
Correct
- Yes
The choices were
- No
- Yes
Help
- http://twig.symfony.com/doc/functions/constant.html
Yes
API

Is Message considered as a high-level API?
Wrong
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.3/components/mime.html#introduction
IP address

Could an IP address be anonymized?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/4.4/components/http_foundation.html#anonymizing-ip-addresses
- https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/HttpFoundation/IpUtils.php
Yes
Configuration per env

Is it possible to configure multiple environments in a single file?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/blog/new-in-symfony-5-3-configure-multiple-environments-in-a-single-file

Yes
Services preload

Could a class be removed from the list of preloaded classes by PHP?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.1/reference/dic_tags.html#container-no-preload

Yes
Monolog

Does Monolog implement the PSR-3 interface?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://github.com/Seldaek/monolog
- https://www.php-fig.org/psr/psr-3/
Yes
Argument resolvers

Given the context where FooService is defined as a service, is the following code valid?
```
<?php
// ...
class HomeController
{
  #[Route('/', name: 'home')]
  public function __invoke(FooService $fooService): Response
  {
    // ...
  }
}
```
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/3.3/controller/argument_value_resolver.html#functionality-shipped-with-the-httpkernel
- https://github.com/symfony/symfony/tree/3.3/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver
Yes

The IsNull validation constraint

Will the following snippet throw an InvalidArgumentException ?

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints\IsNull;
$expectedNull = '';
$validator = Validation::createValidator();
$violations = $validator->validate($expectedNull, [new IsNull()]);
if (0 !== count($violations)) {
    throw new InvalidArgumentException('The value is not null !');
}

Yes

Abstract services

Could a service be defined as parent even if the children service does not extends the parent class?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.7/service_container/parent_services.html

Yes

Runtime usage

Is the following code valid?

<?php
require_once dirname(__DIR__).'/vendor/autoload_runtime.php';
return function (): Closure {
    $app = function(): int {
        echo 'Hello World';
        return 0;
    };
    return $app;
};

https://symfony.com/doc/5.3/components/runtime.html#using-the-runtime

Yes

Mirror usage

When using mirror(...), could files instead of links be mirrored on Windows?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/2.2/components/filesystem.html#mirror
- https://github.com/symfony/symfony/blob/2.2/src/Symfony/Component/Filesystem/Filesystem.php#L338
Yes
Generator usage

Could a generator contains a return statement?
Correct
- Yes
The choices were
- Yes, but empty only
- Yes
- No
Help

https://www.php.net/manual/en/language.generators.syntax.php

Yes
Required services

Could services be tagged as always required when bootstrapping the container?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/3.4/reference/dic_tags.html#container-hot-path

Yes
FlashBag usage

Could the FlashBag messages be retrieved without being removed from the bag?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php

Yes

Config definition

Is the following configuration valid with this definition ?

$rootNode
    ->children()
        ->arrayNode('connections')
            ->prototype('array')
                ->children()
                    ->scalarNode('driver')->end()
                    ->scalarNode('host')->end()
                    ->scalarNode('username')->end()
                    ->scalarNode('password')->end()
                ->end()
            ->end()
        ->end()
    ->end()
;

connections:
    driver: pdo_mysql
    host: mysql
    username: admin
    password: mySecuredPassword

http://symfony.com/doc/current/components/config/definition.html#array-nodes

Mirror usage

When using mirror(...), could existing files be overridden?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/2.2/components/filesystem.html#mirror
- https://github.com/symfony/symfony/blob/2.2/src/Symfony/Component/Filesystem/Filesystem.php#L338
Yes
Configuration

Is it possible to override the error handler used?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#using-options

Yes
Enumerations usage

Could enumerations be used to display a list of choices?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/blog/new-in-symfony-5-4-php-enumerations-support#php-enums-support-in-symfony-forms
- https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Form/Extension/Core/Type/EnumType.php
Yes
Console events

Are console events dispatched when testing commands using CommandTester?
Wrong
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.7/console.html#testing-commands
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Console/Tester/CommandTester.php
BC promise

Is the BC promise guaranteed when adding a new property to a custom class that extends a Symfony class ?
Wrong
- Yes
The choices were
- Yes
- No
Help

http://symfony.com/doc/current/contributing/code/bc.html#using-our-classes
Location header usage

Given a response using the 308 status code and containing a Location header, must the client use the header URI for automatic redirection?
Wrong
- Yes
The choices were
- No
- Yes
Help
- https://tools.ietf.org/html/rfc7538#section-3
- As explained, the user agent MAY use the Location field value for automatic redirection, using it is not a requirement.
Doctrine bridge

Given the context where the doctrine transport is used, could all the handlers be wrapped in a single transaction?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.4/messenger.html#middleware-for-doctrine

Yes
Email usage

Could an email be encrypted?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.4/mailer.html#encrypting-messages

Yes
array_map usage

Could array_map be applied to multiple arrays at the same time?
Correct
- Yes
The choices were
- Yes
- No
Help

https://www.php.net/manual/en/function.array-map

Yes
Service dependency

Can you inject a dependency to a service without passing it to the constructor?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/current/components/dependency_injection.html
- https://symfony.com/doc/current/service_container/injection_types.html
Yes
MockHttpClient usage

Could the amount of requests proceed by MockHttpClient be accessed?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/5.1/http_client.html#testing-http-clients-and-responses
- https://github.com/symfony/symfony/blob/5.1/src/Symfony/Component/HttpClient/MockHttpClient.php
Yes
Fields priority

Can fields be sorted using a priority?
Correct
- Yes
The choices were
- No
- Yes
Help
- Since 5.3, the priority option can be used to sort fields.
- https://symfony.com/blog/new-in-symfony-5-3-form-field-sorting
- https://github.com/symfony/symfony/pull/40690
Yes
DataTransformer

Does a Symfony\Component\Form\Exception\TransformationFailedException thrown in a DataTransformer::reverseTransform cause a validation error ?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.7/form/data_transformers.html
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/Exception/TransformationFailedException.php
Yes
Interfaces

Can interfaces inherit from other interfaces in PHP?
Correct
- Yes
The choices were
- No
- Yes
Help
- http://php.net/interfaces
Yes
Configuration files import

Is the following code valid?
```
# app/config/config.yaml
imports:
    - { resource: '@Acme/config.yml', ignore_errors: true }
# ...
```
YAML
Correct
- Yes
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php#L81
- https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/Config/Loader/FileLoader.php
Yes
Console events

Are console events dispatched when testing commands using ApplicationTester?
Correct
- Yes
The choices were
- No
- Yes
Help
Yes
Environment variables configuration

Is it possible to toggle the debug of Symfony applications when using SymfonyRuntime or GenericRuntime?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#using-options

Yes
Path usage

Could the longest common base path between multiple files be found?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/blog/new-in-symfony-5-4-filesystem-path-class
- https://github.com/symfony/filesystem/blob/5.4/Path.php#L580
Yes
Cache usage

Given the case where the opcache/APC cache for template need to be invalidated, is the following code valid?
```
<?php
// ...
$twig = new Environment($loader, [
    'cache' => new FilesystemCache('/some/cache/path', 1),
    // ...
]);
```
Correct
- Yes
The choices were
- Yes
- No
Help

https://twig.symfony.com/doc/1.x/recipes.html#refreshing-modified-templates-when-opcache-or-apc-is-enabled

Yes
Services alias

Could aliases of services be defined via a value of container parameter?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.7/reference/dic_tags.html#auto-alias
- https://github.com/symfony/symfony/blob/2.7/src/Symfony/Component/DependencyInjection/Compiler/AutoAliasServicePass.php
Yes
OOP

Can an interface extend another interface?
Correct
- Yes
The choices were
- Yes
- No
Help

http://php.net/manual/en/language.oop5.interfaces.php

Yes

Console status code

Is the following code valid?

<?php
// ...
class FooCommand extends Command
{
  protected function execute(InputInterface $input, OutputInterface $output): int
  {
    // ...
    return Command::INVALID;
  }
}

https://symfony.com/doc/5.3/console.html#creating-a-command

Yes

Route priority

Could a priority be set when adding a new Route via RouteCollection::add()?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Routing/RouteCollection.php#L85

Yes

Sequentially usage

Is the following code valid?

<?php
namespace App\Localization;
use App\Validator\Constraints as AcmeAssert;
use Symfony\Component\Validator\Constraints as Assert;
class Place
{
  private const ADDRESS_REGEX = # ...
  #[Assert\Sequentially([
    new Assert\NotNull,
    new Assert\Type('string'),
    new Assert\Length(min: 10),
    new Assert\Regex(Place::ADDRESS_REGEX),
    new AcmeAssert\Geolocalizable,
  ])]
  public $address;
}

The Sequentially attribute has been introduced in 5.4, keep in mind that nested attributes requires PHP 8.1 or higher
https://symfony.com/doc/5.4/validation/sequence_provider.html#how-to-sequentially-apply-constraints-on-a-single-property
https://symfony.com/doc/5.4/reference/constraints/Sequentially.html

Yes

If-Match usage

Could the If-Match header be used with a PUT request?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Match
Yes

PHP Basics

Is the following exception class valid ?

class MyException implements Throwable
{
  private $message;
  private $code;
  private $file;
  private $line;
  private $trace;
  private $previous;
  public function __construct($message, $code, $file, $line, array $trace, Throwable $previous)
  {
    $this->message = $message;
    $this->code = $code;
    $this->file = $file;
    $this->line = $line;
    $this->trace = $trace;
    $this->throwable = $throwable;
  }
  public function getMessage()
  {
    return $this->message;
  }    
  public function getCode()
  {
    return $this->code;
  }
  public function getFile()
  {
    return $this->file;
  }
  public function getLine()
  {
    return $this->line;
  }
  public function getTrace()
  {
    return $this->trace;
  }
  public function getTraceAsString()
  {
    return serialize($this->trace);
  }
  public function getPrevious()
  {
    return $this->previous;
  }
  public function __toString()
  {
      return sprintf('%d: %s', $this->code, $this->message);
  }
}

https://www.php.net/manual/en/class.throwable.php

Magic methods usage

Could the usage of __set() method be disabled?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.2/components/property_access.html#enable-other-features

Yes
Enumeration - Transformation from null

Is the following code valid?
```
<?php
enum Suit: string
{
    case Hearts = 'H';
    case Diamonds = 'D';
    case Clubs = 'C';
    case Spades = 'S';
}
$h = Suit::tryFrom('E') ?? Suit::from('H');
```
Correct
- Yes
The choices were
- No
- Yes
Help
- https://www.php.net/manual/en/backedenum.tryfrom.php
- https://www.php.net/manual/en/backedenum.from.php
Yes

FrameworkBundle

Is the following routing configuration valid ?

redirect:
  path: /old-path
  controller: 'Symfony\Bundle\FrameworkBundle\Controller\RedirectController'
  defaults:
    path: /new-path

https://symfony.com/doc/4.4/routing.html

Yes

VCS files

Could the files that match .gitignore patterns be ignored?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/4.3/components/finder.html#version-control-files
- https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/Finder/Finder.php
Yes
Request method

Does the 308 status code allow to change the request method?
Wrong
- Yes
The choices were
- Yes
- No
Help

https://tools.ietf.org/html/rfc7538#section-3
Validation

Is Symfony\Component\Form\Form::isValid() the method responsible for validating its data?
Wrong
- Yes
The choices were
- No
- Yes
Help

ValidationListener actually do the job
- https://github.com/symfony/symfony/blob/0baa58d4e4bb006c4ae68f75833b586bd3cb6e6f/src/Symfony/Component/Form/Form.php#L744
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/Extension/Validator/EventListener/ValidationListener.php
Usage

Can a custom type guesser be created?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/4.3/components/mime.html#adding-a-mime-type-guesser
Yes
Service

It is possible to change the class of a service using the ContainerBuilder?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/current/components/dependency_injection/definitions.html
Yes

Serialization Context

Is the following code valid ?


#[Serializer\Context(
    normalizationContext: [DateTimeNormalizer::FORMAT_KEY => \DateTime::RFC3339],
    groups: ['extended']
)]
public \DateTime $date;

https://symfony.com/blog/new-in-symfony-5-3-inlined-serialization-context

Yes

The IsTrue validation constraint

Will the following snippet throw an InvalidArgumentException ?

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints\IsTrue;
$expectedTrue = 123;
$validator = Validation::createValidator();
$violations = $validator->validate($expectedTrue, [new IsTrue()]);
if (0 !== count($violations)) {
    throw new InvalidArgumentException('The value is not true !');
}

https://symfony.com/doc/current/reference/constraints/IsTrue.html

Yes

Usage

Given the context where an application runs under the prod environment and an external library that use getenv() to access environment variables, is it possible to force DotEnv to use putenv() instead of defining environment variables at the machine level?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#using-options

Yes
Execution

Could an application be executing without return something (aka void)?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/current/components/runtime.html#resolvable-applications

Yes
ContainerBuilder usage

Could the fact that a class is available and will remain available in the --no-dev mode of Composer be obtained when using ContainerBuilder?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/DependencyInjection/ContainerBuilder.php#L1454

Yes
SplFileInfo usage

Is the following code valid?
```
<?php
use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    echo $file->getMTime();
}
```
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/current/components/finder.html#usage
- https://www.php.net/manual/en/class.splfileinfo.php
Yes
Request Handling

Can the Request object be modified during its handling ?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/current/components/http_foundation.html
Yes
Connecting Listeners

Is it possible to make the same listener object listen to multiple events?
Correct
- Yes
The choices were
- Yes
- No
Help
- http://symfony.com/doc/current/components/event_dispatcher/introduction.html#connecting-listeners
Yes
ContainerBag usage

Could a new parameter be set into a ContainerBag?
Wrong
- Yes
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/DependencyInjection/ParameterBag/ContainerBag.php
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php#L53
Generators

In PHP 7, can a generator contain a return statement ?
Correct
- Yes
The choices were
- No
- Yes, but empty only
- Yes
Help

http://php.net/manual/en/language.generators.syntax.php

Yes
Firewall Definitions

Is this firewall valid ?
```
security:
    firewalls:
        main:
            provider: app_user_provider
```
YAML
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/current/security.html#the-firewall
Yes
File locking

Is it possible to write in a file while locking it?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://www.php.net/manual/en/function.flock.php
- https://symfony.com/doc/5.4/components/filesystem.html#appendtofile
Yes
Safe response

Could a response be marked as safe?
Correct
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/5.1/src/Symfony/Component/HttpFoundation/Response.php#L1242

Yes
Headers

Is there any required header in a request to an origin server or gateway for almost every request ?
Correct
- Yes
The choices were
- No
- Yes
Help

https://datatracker.ietf.org/doc/html/rfc7230#section-5.4

Yes
ConstraintViolationList creation

Could a ConstraintViolationList be created from a single violation message?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Validator/ConstraintViolationList.php#L40
- https://github.com/symfony/symfony/pull/41154
Yes
Service id

Are service ids considered as case-sensitive?
Correct
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/blog/new-in-symfony-3-3-dependency-injection-deprecations#deprecated-the-case-insensitivity-of-service-identifiers

Yes
Usage

Could enumerations be dumped?
Correct
- Yes
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/pull/41072

Yes
Kernel configuration

Could the build directory be overridden?
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/5.2/reference/configuration/kernel.html#build-directory
- https://github.com/symfony/symfony/blob/5.2/src/Symfony/Component/HttpKernel/Kernel.php#L337
Yes
Null values

Could null values be skipped?
Correct
- Yes
The choices were
- Yes
- No
Help

https://symfony.com/doc/4.2/components/serializer.html#skipping-null-values

Yes
Event dispatching

Could an event be dispatched without creating a custom event class?
Correct
- Yes
The choices were
- Yes
- No
Help
- https://symfony.com/doc/2.1/components/event_dispatcher/generic_event.html
- https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/GenericEvent.php
Yes
Translation

Is the translation activated by default?
Wrong
- Yes
The choices were
- Yes
- No
Help
- http://symfony.com/doc/current/book/translation.html#configuration
DataTransformer

Are Data Transformers applied on a form field which has the inherit_data option set ?
Wrong
- Yes
The choices were
- No
- Yes
Help

http://symfony.com/doc/current/form/data_transformers.html
Private services

Let's assume, we have a private service my_private_service.
```
$container->get('my_private_service');
```
Will it work?
Wrong
- Yes
The choices were
- No
- Yes
Help

https://symfony.com/doc/current/service_container/alias_private.html
ImmutableEventDispatcher usage

Could listeners be removed from an ImmutableEventDispatcher?
Wrong
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

Calls

Regarding the following code, will the calls directive of service_parent be overridden by the one from service_child ?

    logger_A:
        class: Acme\Logger\TextLogger
    logger_B:
        class: Acme\Logger\EchoLogger
    service_parent:
        abstract: true
        calls:
            - ['addLogger', ['@logger_A']]
    service_child:
        parent: @service_parent
        class: Acme\Transformer\TextTransformer
        calls:
            - ['addLogger', ['@logger_B']]

https://symfony.com/doc/3.1/service_container/parent_services.html

Arguments resolution

Could arguments be resolved in a controller not tagged with the controller.service_arguments tag?
Wrong
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/HttpKernel/Controller/ArgumentResolver/NotTaggedControllerValueResolver.php
Zip

Does PHP provide an extension to work with Zip files by default?
Wrong
- Yes
The choices were
- No
- Yes
Help

http://php.net/manual/en/book.zip.php
Address usage

Could a new Address be created using Address::fromString()?
Wrong
- Yes
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Mime/Address.php

Attributes Groups

Which of the following is a correct YAML group definition?

Acme\MyObj:
    groups:
        group1:
            attributes: ['foo']
        group2:
            attributes: ['foo']
        group3:
            attributes: ['bar']

Acme\MyObj:
    group1:
        attributes: ['foo']
    group2:
        attributes: ['foo']
    group3:
        attributes: ['bar']

Acme\MyObj:
    groups:
        group1:
            attributes: ['foo']
        group2:
            attributes: ['foo']
        group3:
            attributes: ['bar']

Acme\MyObj:
    attributes:
        foo:
            groups: ['group1', 'group2']
        bar:
            groups: ['group3']

Acme\MyObj:
    foo:
        groups: ['group1', 'group2']
    bar:
        groups: ['group3']

http://symfony.com/doc/current/components/serializer.html#attributes-groups

YAML group definition? Wrong Acme\MyObj: groups: group1: attributes: ['foo'] group2: attributes: ['foo'] group3: attributes: ['bar']YAML

Translation Source File Format

According to the official Symfony Best Practices Guide, which format do you need to use for your translation files?
Correct
- XLIFF
The choices were
- CSV
- YAML
- XLIFF
- JSON
Help

https://symfony.com/doc/current/best_practices.html#use-the-xliff-format-for-your-translation-files

XLIFF

Reading from Objects

What will be the value of $firstName?

<?php
use Symfony\Component\PropertyAccess\PropertyAccess;
$accessor = PropertyAccess::createPropertyAccessor();
class Person {
    public $firstName;
    public function getFirstName()
    {
        return 'Ryan';
    }
}
$person = new Person();
$person->firstName = 'Wouter';
$firstName = $accessor->getValue($person, 'firstName');

Wouter

Wouter
Ryan

Validation

How can you disable the validation in a form?
Correct
- With the validation_groups option set to false
The choices were
- By not calling isValid()
- With the validation_groups option set to false
- By calling isValid(false)
- With the no_validation option set to true
Help
- http://symfony.com/doc/current/form/disabling_validation.html
With the validation_groups option set to false
Configuration

How can you get the value of the current configuration directives (php.ini) of a PHP extension?
Correct
- With the reflection API
- With ini_get_all()
The choices were
- With get_loaded_extensions()
- With php://config stream
- With the reflection API
- With ini_get_all()
- With the $GLOBALS array
Help
With the reflection API With ini_get_all()
Messenger

How can you retrieve a result generated by a handler ?
Correct
- With a stamp
The choices were
- With a stamp
- With the handler.registry service
- It's not possible due to the asyncronous behavior of the messenger component
Help
- https://symfony.com/doc/4.2/messenger/handler_results.html
With a stamp
Processing Forms

What triggers the form processing in controllers ?
Wrong
- With $form->process().
The choices were
- With $form->isSubmitted().
- With $form->process().
- With $form->isValid().
- With $form->handleRequest().
Help
- https://symfony.com/doc/current/components/form.html
HttpKernelInterface

What is the third argument of the handle method of Symfony\Component\HttpKernel\HttpKernelInterface?
Correct
- Whether to catch exceptions or not.
The choices were
- The name of the environment
- A Request instance
- Whether to catch exceptions or not.
- The type of the request
- Whether to activate the debug or not
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpKernel/HttpKernelInterface.php#L42
Whether to catch exceptions or not.
Dependency Injection

Which sentences are true about compiler pass registration ?
Wrong
- When a compiler pass is registered, you can chose the step where it will be executed. 5 steps are available
- Compiler pass can be registered in the build method of the Kernel
- Compiler pass are automatically registered if they implement CompilerPassInterface and autoconfigure is set to true
The choices were
- Compiler pass can be registered in the build method of the Kernel
- When a compiler pass is registered, you can chose the step where it will be executed. 6 steps are available
- Compiler pass are automatically registered if they implement CompilerPassInterface and autoconfigure is set to true
- When a compiler pass is registered, you can chose the step where it will be executed. 4 steps are available
- When a compiler pass is registered, you can chose the step where it will be executed. 5 steps are available
Help
- https://symfony.com/doc/3.3/service_container/compiler_passes.html
- https://symfony.com/doc/3.3/components/dependency_injection/compilation.html
Vary header usage

Which of the followings are valid usage of the Vary header?
Wrong
- Vary: User-Agent
- Vary: *
The choices were
- Vary: Accept-Encoding
- Vary: Cookie
- Vary: User-Agent
- Vary: *
- Vary: Referer
Help
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Vary
- https://www.fastly.com/blog/best-practices-using-vary-header
Luhn Constraint

What does the Luhn constraint do?
Correct
- Validates a card number
The choices were
- Validates a card number
- Validates an ISBN number
- It doesn't exist
- Validates an IBAN number
Help

https://symfony.com/doc/2.3/reference/constraints/Luhn.html

Validates a card number
Security

How would you use the SHA-512 hash algorithm in PHP?
Wrong
- Using the sha512() function
- Using the hash() function
The choices were
- Using the crypt() function
- Using the sha512() function
- Using the hash() function
Help
- http://php.net/manual/en/function.crypt.php
- http://php.net/manual/en/function.hash.php
Validate an object

How can you validate an object but only against a subset of the constraints ?
Wrong
- Using the method validate partial() instead of validate(), as it accepts a list of constraints.
The choices were
- Using the method validate partial() instead of validate(), as it accepts a list of constraints.
- Using roles.
- Using validation groups.
- It is not possible to partially validate an object.
Help

http://symfony.com/doc/current/validation/groups.html
Controller

Given the full Symfony framework is installed, how to create a new controller ?
Correct
- Using the make:controller command
- Manually creating a class in the Controller folder
The choices were
- Using the make-controller command
- Using the make:controller command
- Manually creating a class in the Controller folder
- Using the create:controller command
- Using the create-controller command
Help
- https://symfony.com/doc/current/the-fast-track/en/6-controller.html
- https://symfony.com/doc/6.3/page_creation.html
Using the make:controller command Manually creating a class in the Controller folder
Console autocompletion

How could be defined the autocompletion suggestions of a command?
Correct
- Using the complete method
The choices were
- Using the complete method
- Using the autocomplete method
- It's not possible
- Using the suggest method
Help
- https://symfony.com/blog/new-in-symfony-5-4-console-autocompletion
- https://github.com/symfony/symfony/blob/5.4/src/Symfony/Component/Console/Command/Command.php#L308
Using the complete method
Detect click on a SubmitType

How one can detect that a given Symfony\Component\Form\Extension\Core\Type\SubmitType form type has been clicked ?
Wrong
- Using the clicked method of the given submit button.
The choices were
- Using the isClicked method of the given submit button.
- Using the clicked method of the given parent form.
- Using the clicked method of the given submit button.
- Using the isClicked method of the parent form.
Help

https://symfony.com/doc/current/reference/forms/types/submit.html
PHP strings

Identify the best approach to compare two variables in a binary-safe fashion
Correct
- Using strcmp()
- Using === operator
The choices were
- Using === operator
- Using == operator
- Using strstr()
- Using strcmp()
- Using str_sompare()
Help
Using strcmp() Using === operator
Usage

How can we define the status code of MockResponse?
Wrong
- Using status_code option
The choices were
- It's not possible
- Using status_code option
- Using http_code option
Help

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpClient/Response/MockResponse.php#L45
Response headers

Which of these headers don't belong to the Response ?
Correct
- User-Agent
- Referer
The choices were
- User-Agent
- Proxy-Authenticate
- Referer
- WWW-Authenticate
Help

https://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html#sec6.2

User-Agent Referer
Headers

How does the browser communicate to the server what is the preferred language of the user?
Correct
- User language preferences are sent using the Accept-Language header
The choices were
- User language preferences are sent using the Accept-Language header
- The main language is sent using the Locale header, while secondary languages are usually included in the X-Locale-Alternate header.
- The browser doesn’t communicate the language of the user, it’s inferred from the user IP.
- The main language is included in the User-Agent header
Help

https://www.w3.org/International/questions/qa-lang-priorities

User language preferences are sent using the Accept-Language header
MIME message part: `multipart/related`

What is the purpose of the multipart/related MIME message part?
Correct
- Used to indicate that each message part is a component of an aggregate whole. The most common usage is to display images embedded in the message contents
The choices were
- Used to send different content types in the same message, such as when attaching files
- Used when two or more parts are alternatives of the same (or very similar) content. The preferred format must be added last
- Used to indicate that each message part is a component of an aggregate whole. The most common usage is to display images embedded in the message contents
Help

https://symfony.com/doc/current/components/mime#creating-raw-email-messages

Used to indicate that each message part is a component of an aggregate whole. The most common usage is to display images embedded in the message contents
MIME message part: `multipart/alternative`

What is the purpose of the multipart/alternative MIME message part?
Wrong
- Used to indicate that each message part is a component of an aggregate whole. The most common usage is to display images embedded in the message contents
The choices were
- Used to indicate that each message part is a component of an aggregate whole. The most common usage is to display images embedded in the message contents
- Used when two or more parts are alternatives of the same (or very similar) content. The preferred format must be added last
- Used to send different content types in the same message, such as when attaching files
Help

https://symfony.com/doc/current/components/mime#creating-raw-email-messages
URLs in a Functional Test

According to the official Symfony Best Practices Guide, what is the recommended way to use URLs in a functional test?
Wrong
- Use the URL generator
The choices were
- Hardcode the URLs
- Do not use URLs in a functional test
- Use the URL generator
Help

https://symfony.com/doc/current/best_practices/tests.html#hardcode-urls-in-a-functional-test
Password confirmation

What solution can you use to ask the user to type his password twice in a form ?
Correct
- Use the RepeatedType form type.
The choices were
- Use the ask_confirmation option on the PasswordType form type.
- Use the Validation plugin of jQuery.
- Call the render_widget twig function twice on the password form type.
- Use the RepeatedType form type.
Help

https://symfony.com/doc/current/reference/forms/types/repeated.html

Use the RepeatedType form type.
Authorization

According to the official Symfony Best Practices Guide, which method do you need to use in order to protect broad URL patterns?
Wrong
- Use the @Security annotation
The choices were
- Use access_control in the security configuration
- Use the security.authorization_checker service
- Use the @Security annotation
Help
- https://symfony.com/doc/4.0/best_practices/security.html#authorization-i-e-denying-access
- https://symfony.com/doc/current/security/access_control.html
SecurityBundle

If you're using an API and after being authenticated you don't want the session to be kept for the next requests; you have to:
Correct
- Use stateless: true at firewall level
The choices were
- Use session: false at firewall level
- Use session: false at authentication provider level
- Use stateless: true at firewall level
- Use stateless: true at authentication provider level
- Simply use json_login authentication provider
Help
- https://symfony.com/doc/2.8/security/guard_authentication.html
Use stateless: true at firewall level
Accessing standard i/o streams

When writing CLI scripts, how can you access the standard input/output/error streams?
Correct
- Use STDIN, STDOUT and STDERR constants
The choices were
- Use stdin(), stdout() and stderr() functions
- Use php::STDIN, php::STDOUT, php::STDERR class constants
- Use STDIN, STDOUT and STDERR constants
- use FD_0, FD_1 and FD_2 constants
Help

http://php.net/manual/en/features.commandline.php

Use STDIN, STDOUT and STDERR constants
`HttpClient`: cookies support

How to configure the HTTP Client provided by the Symfony HttpClient component to save a Cookie between requests?
Wrong
- Use $client->setCookie(new Cookie(...))
The choices were
- Use $client->setCookie(new Cookie(...))
- The HTTP Client provided by the Symfony HttpClient component does not handle cookies.
- Use $client->getCookieJar()->set(new Cookie(...))
- Use $client->cookies->set(new Cookie(...))
Help

https://symfony.com/doc/6.0/http_client.html#cookies
Variables

Consider the following code snippet:
```
{% set foo, bar = 'FOO' %}
<p>
  Foo is {{ foo }} and Bar is {{ bar }}.
</p>
```
Twig
What will be the outcome of evaluating this Twig code?
Correct
- Twig will raise a Twig_Error_Syntax exception.
The choices were
- The output will display the string Foo is FOO and Bar is ..
- The output will display the string Foo is and Bar is ..
- The output will display the string Foo is FOO and Bar is FOO..
- Twig will raise a Twig_Error_Syntax exception.
Help
- https://twig.symfony.com/doc/tags/set.html
Twig will raise a Twig_Error_Syntax exception.
Template Inheritance

Consider the following Twig code snippet:
```
{% extends 'layout.html.twig' %}
{% block title 'Hello World!' %}
My name is Amanda.
```
Twig
What will be the result of evaluating this Twig template?
Correct
- Twig will raise a Twig_Error_Syntax exception preventing the template from being evaluated.
The choices were
- The template is successfully evaluated and the string My name is Amanda will be displayed in the web browser.
- Twig will raise a Twig_Error_Syntax exception preventing the template from being evaluated.
Help

http://twig.symfony.com/doc/tags/extends.html

Twig will raise a Twig_Error_Syntax exception preventing the template from being evaluated.
Strict Variables Mode

Consider the following Twig code snippet:
```
The {{ color }} car!
```
Twig
What will be the result of evaluating this template without passing it a color variable when the strict_variables global setting is on?
Correct
- Twig will raise a Twig_Error_Runtime exception preventing the template from being evaluated.
The choices were
- The template will be partially evaluated and the string The will be displayed in the web browser.
- The template will be succesfully evaluated and the string The car! will be displayed in the web browser.
- Twig will raise a Twig_Error_Runtime exception preventing the template from being evaluated.
- The template will be succesfully evaluated and the string The empty car! will be displayed in the web browser.
Help
Twig will raise a Twig_Error_Runtime exception preventing the template from being evaluated.
Public or Private

By default, registered services are private?
Correct
- True
The choices were
- False
- True
Help

https://github.com/symfony/symfony/blob/4.0/src/Symfony/Component/DependencyInjection/Definition.php

True
Bundle Best Practices

To strictly follow the best practices for reusable bundles, the file that contains the basic description of the bundle should be named README.md.
Correct
- True
The choices were
- False
- True
Help

https://symfony.com/doc/6.0/bundles/best_practices.html#directory-structure

True
Best Practices

To follow the best practices for reusable bundles, the file that contains the basic description of the bundle must be named README.md:
Correct
- True
The choices were
- False
- True
Help
- https://symfony.com/doc/5.0/bundles/best_practices.html
True
Authentication

Authentication is the process that makes sure that a user is who he claims to be?
Correct
- True
The choices were
- False
- True
Help
- https://symfony.com/doc/current/components/security/authentication.html
True
HttpClient

HttpClient provide a MockResponse class because you can't create your own mock of ResponseInterface to test it
Wrong
- True
The choices were
- True
- False
Help
- https://symfony.com/doc/5.0/components/http_client.html
HTTP

HTTP PURGE method was added to http/1.1 to allow to mark pages cached by proxies as stales.
Wrong
- True
The choices were
- False
- True
Help
- https://symfony.com/doc/2.7/http_cache/cache_invalidation.html
- https://tools.ietf.org/html/rfc2616
Streaming to the Standard Input of a Process

Which types of argument accepts the Symfony\Component\Process\InputStream\write() method?
Wrong
- Traversable objects
- Boolean
- Scalars
The choices were
- Boolean
- Stream resources
- Scalars
- Traversable objects
- Arrays
Help
- https://symfony.com/doc/3.x/components/process.html#streaming-to-the-standard-input-of-a-process
- https://github.com/symfony/symfony/blob/3.1/src/Symfony/Component/Process/InputStream.php#L35
Twig internals

Which token is used by the Lexer to find the end of a template?
Correct
- Token::EOF_TYPE
The choices were
- Token::END_OF_FILE
- Token::EOF
- Token::END_OF_FILE_TYPE
- Token::EOF_TYPE
Help

https://twig.symfony.com/doc/1.x/internals.html#the-lexer

Token::EOF_TYPE
Processes to wait until...

What does the waitUntil method allow you to do?
Wrong
- To wait for a condition to be verified before killing the running async process
The choices were
- To wait for a certain amount of time before killing the running async process
- To wait for a condition to be verified before continuing the main script execution
- To wait for a condition to be verified before killing the running async process
Help

https://symfony.com/doc/current/components/process.html#running-processes-asynchronously
disallowMockingUnknownTypes

What is the goal of calling disallowMockingUnknownTypes() when creating a stub or mock?
Correct
- To throw an Exception if the class or the interface does not exist.
The choices were
- To throw an Exception if the interface does not exist.
- To throw an Exception if the class does not exist.
- To throw an Exception if the class or the interface does not exist.
- To throw an Exception if the class is not a native PHP class.
Help
- https://github.com/sebastianbergmann/phpunit-mock-objects/blob/4.0.4/src/Generator.php#L103-L128
- https://github.com/sebastianbergmann/phpunit-mock-objects/blob/6.1.2/src/Generator.php#L114-L139
To throw an Exception if the class or the interface does not exist.
Sending the Response

What is the aim of the prepare() method in Symfony\Component\HttpFoundation\Response?
Wrong
- To send the Response to the client.
The choices were
- To tweak the Response to ensure that it is compliant with RFC 2616.
- To convert the Response to a string that is compatible with the HTTP response message format.
- To send the Response to the client.
Help
- https://symfony.com/doc/2.8/components/http_foundation.html#sending-the-response
- https://github.com/symfony/symfony/blob/0baa58d4e4bb006c4ae68f75833b586bd3cb6e6f/src/Symfony/Component/HttpFoundation/Response.php#L204
UrlType value prepending

What is the use of the default_protocol option of the Symfony\Component\Form\Extension\Core\Type\UrlType form type ?
Wrong
- To force the submitted value to begin with a given URI scheme (eg. http://).
The choices were
- To prepend the submitted value with an URI scheme (eg. http://) if it does not begin with one.
- To render the input with the placeholder property containing the value of the option.
- To force the submitted value to begin with a given URI scheme (eg. http://).
Help

http://symfony.com/doc/current/reference/forms/types/url.html
Service Autoconfiguration

What is the purpose of Autoconfiguration in Symfony ?
Correct
- To automatically configure services based on their class, attributes or interface.
The choices were
- To automatically configure services based on their class, attributes or interface.
- To automatically decorate services based on their class, attributes or interface.
- To automatically register services based on their class, attributes or interface.
Help
- https://symfony.com/doc/current/service_container.html#services-autoconfigure
To automatically configure services based on their class, attributes or interface.

Traits

Consider the following PHP code snippet:

trait HelloTrait
{
    private function hello()
    {
        return 'Hello';
    }
}
class PoliteGreeter
{
    use HelloTrait;
    public function greet($someone)
    {
        return $this->hello() . ' '. $someone .'!';
    }
}
class YoGreeter extends PoliteGreeter
{
    private function hello()
    {
        return 'Yo';
    } 
}
$greeter = new YoGreeter();
echo $greeter->greet('World');

What will be the outcome of running this code with PHP 5.4 or greater?

This snippet displays the string Yo World! on the standard output.

PHP will raise a Fatal Error preventing the private hello() method from being overriden in the YoGreater class.
This snippet displays the string Yo World! on the standard output.
This snippet displays the string Hello World! on the standard output.

http://php.net/manual/fr/language.oop5.traits.php

Streams

Which of the following are not true about streams ?
Wrong
- They are always seekable.
- They can be applied to any data source.
- They are always bi-directional.
The choices were
- They can be filtered.
- They can be applied to any data source.
- They are always bi-directional.
- They are always seekable.
- When used properly, they significantly reduce memory consumption.
Help

http://php.net/manual/en/book.stream.php
Compiler Passes

Which of the following statements are true about the so-called compiler passes?
Wrong
- They allow to add, alter or remove any services definitions of a ContainerBuilder object.
- They prevent the ContainerBuilder object from being compiled if they detect any circular references in services definitions.
- They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.
- They check that all registered services definitions are valid and some required global parameters are not missing.
- They are always triggered on every HTTP requests made to the Symfony application.
The choices were
- They allow to add, alter or remove any services definitions of a ContainerBuilder object.
- They prevent the ContainerBuilder object from being compiled if they detect any circular references in services definitions.
- They are always triggered on every HTTP requests made to the Symfony application.
- They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.
- They check that all registered services definitions are valid and some required global parameters are not missing.
Help
- https://symfony.com/doc/current/service_container/compiler_passes.html#main
- https://github.com/symfony/symfony/blob/master/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
Compiler Passes

Which of the following statements are true about the so-called compiler passes?
Wrong
- They allow to add, alter or remove any services definitions of a ContainerBuilder object.
- They prevent the ContainerBuilder object from being compiled if they detect any circular references in services definitions.
- They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.
The choices were
- They prevent the ContainerBuilder object from being compiled if they detect any circular references in services definitions.
- They check that all registered services definitions are valid and some required global parameters are not missing.
- They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.
- They allow to add, alter or remove any services definitions of a ContainerBuilder object.
- They are always triggered on every HTTP requests made to the Symfony application.
Help
- https://symfony.com/doc/current/service_container/compiler_passes.html#main
- https://github.com/symfony/symfony/blob/master/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
Compiler Passes

Which of the following statements are true about the so-called compiler passes?
Wrong
- They allow to add, alter or remove any services definitions of a ContainerBuilder object.
- They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.
- They check that all registered services definitions are valid and some required global parameters are not missing.
The choices were
- They perform some optimization operations on a ContainerBuilder instance in order to generate the most efficient PHP code possible.
- They are always triggered on every HTTP requests made to the Symfony application.
- They prevent the ContainerBuilder object from being compiled if they detect any circular references in services definitions.
- They allow to add, alter or remove any services definitions of a ContainerBuilder object.
- They check that all registered services definitions are valid and some required global parameters are not missing.
Help
- https://symfony.com/doc/current/service_container/compiler_passes.html#main
- https://github.com/symfony/symfony/blob/master/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php
Property access

Consider the following code snippet:
```
class Book
{
    protected $title;
}
$book = new Book;
```
How to retrieve the book title from $book?
Correct
- There's no way yet.
The choices were
- $book->title
- There's no way yet.
- $book.title
- $book=>title
Help

http://php.net/manual/en/language.oop5.visibility.php

There's no way yet.
MySQLi

Consider the following code snippet:
```
$query = "SELECT `first`, `last`, `phone` FROM `contacts` WHERE `first` LIKE 'John%'";
$statement = mysqli_prepare($query);
mysqli_stmt_execute($statement);
????
while ($result = mysqli_stmt_fetch($statement)) {
    echo sprintf("Name: %s %s\n", $first, $last);
    echo sprintf("Phone: %s\n\n", $phone);
}
```
Which of the following statements is a valid replacement for the ???? in the above code snippet to execute successfully?
Wrong
- There is nothing to do! The $first, $last and $phone variables will become automatically defined if the SQL query execution was succesful.
The choices were
- ```
mysqli_stmt_bind_result($statement, $first, $last, $phone);
```
- A while loop fetching the row and assigning $first, $last and $phone their proper values.
- ```
mysqli_fetch_columns($statement, $first, $last, $phone);
```
- There is nothing to do! The $first, $last and $phone variables will become automatically defined if the SQL query execution was succesful.
Help
Reading from Arrays

What will be the result of the following code?
```
<?php
use Symfony\Component\PropertyAccess\PropertyAccess;
$accessor = PropertyAccess::createPropertyAccessor();
$person = array(
    'first_name' => 'Wouter',
);
$age = $accessor->getValue($person, 'age');
```
Wrong
- The value of $age will be null.
The choices were
- The value of $age will be null.
- The value of $age will be 0.
- A Symfony\Component\PropertyAccess\Exception\NoSuchIndexException will be thrown.
- A Symfony\Component\PropertyAccess\Exception\NoSuchPropertyException will be thrown.
Help
Provider

What are the particularities of the InMemoryUserProvider security provider?
Wrong
- The users are not stored in database.
- The users must have a plaintext password.
The choices were
- The users must have a plaintext password.
- The users are not stored in database.
- You need to add new user in the config.
- The users have the same password.
Help

https://symfony.com/doc/2.x/security.html#b-configuring-how-users-are-loaded
Strict Variables Mode

Consider the following Twig code snippet:
```
The {{ color }} car!
```
Twig
What will be the result of evaluating this template when passing it the blue value for the color variable and when the strict_variables global setting is off?
Correct
- The template will be succesfully evaluated and the string The blue car! will be displayed in the web browser.
The choices were
- Twig will raise a Twig_Error_Runtime exception preventing the template from being evaluated.
- The template will be succesfully evaluated and the string The blue car! will be displayed in the web browser.
Help
The template will be succesfully evaluated and the string The blue car! will be displayed in the web browser.
Strict Variables Mode

Consider the following Twig code snippet:
```
The {{ color }} car!
```
Twig
What will be the result of evaluating this template without passing it a color variable when the strict_variables global setting is off?
Correct
- The template will be succesfully evaluated and the string The car! will be displayed in the web browser.
The choices were
- The template will be succesfully evaluated and the string The empty car! will be displayed in the web browser.
- The template will be succesfully evaluated and the string The car! will be displayed in the web browser.
- Twig will raise a Twig_Error_Runtime exception preventing the template from being evaluated.
- The template will be partially evaluated and the string The will be displayed in the web browser.
Help
The template will be succesfully evaluated and the string The car! will be displayed in the web browser.
Console

Given the following console table creation:
```
<?php
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\Table;
class MyCommand extends Command
{
  // ...
  protected function execute(InputInterface $input, OutputInterface $output): int
  {
     $table = new Table($output);
     $table->setRows([['foo1', 'foo2']]);
     $table->render();
     $table->appendRow(['bar1', 'bar2']);
     return 0;
  }
}  
```
What will happen ?
Wrong
- The table will have two rows with two values each
The choices were
- An exception will be thrown
- The table will have only one row with two values
- The table will have two rows with two values each
Help
- https://symfony.com/doc/4.1/components/console/helpers/table.html
- https://github.com/symfony/symfony/blob/0578fdf038f225524929373bf1b0d33129f1be13/src/Symfony/Component/Console/Helper/Table.php#L269
Console

Given the following console table creation:
```
<?php
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\Table;
class MyCommand extends Command
{
  // ...
  protected function execute(InputInterface $input, OutputInterface $output): int
  {
     $table = new Table($output);
     $table->setRows([['foo1', 'foo2']]);
     $table->render();
     $table->appendRow(['bar1', 'bar2']);
     return 0;
  }
}  
```
What will happen ?
Wrong
- The table will have only one row with two values
The choices were
- The table will have only one row with two values
- The table will have two rows with two values each
- An exception will be thrown
Help
- https://symfony.com/doc/4.1/components/console/helpers/table.html
- https://github.com/symfony/symfony/blob/0578fdf038f225524929373bf1b0d33129f1be13/src/Symfony/Component/Console/Helper/Table.php#L269
Must-understand usage

Which information is used to store a response that uses the must-understand directive?
Correct
- The status code
The choices were
- The status code
- The value of the Etag directive
- The value of the Expires directive
- The value of the Last-Modified directive
Help

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#must-understand

The status code
Service Priority

When configuring tags with priority, what service will come first when getting tagged items ?
Correct
- The service with the highest priority.
The choices were
- The service with the highest priority.
- The service with the priority closest to 0.
- The service with the lowest priority.
Help
- https://symfony.com/doc/5.x/service_container/tags.html#tagged-services-with-priority
The service with the highest priority.
The Serialization Process

What is normalization in the context of the Serializer Components ?
Wrong
- The process of converting an object into a string.
The choices were
- The process of converting an object into a string.
- The process of converting a string into an object.
- The process of converting an array of scalars into an object.
- The process of converting an object into an array of scalars.
Help
- https://symfony.com/doc/5.x/components/serializer.html
Construct a route in PHP

When declaring a route in PHP, what is the 1st argument of the constructor of the Route class?
Correct
- The path pattern to match.
The choices were
- The path pattern to match.
- An array of options.
- A condition that should evaluate to true for the route to match.
- A required URI scheme or an array of restricted schemes.
- The host pattern to match.
- The required HTTP methods.
- An array of requirements for parameters (regexes).
- An array of default parameter values.
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Routing/Route.php#L62

The path pattern to match.
FileLocator

What is the first argument of the Symfony\Component\Config\FileLocator::locate method?
Correct
- The name of the file to look for.
The choices were
- The type of file to look for.
- The name of the directory to look for.
- The name of the configuration value to look for.
- The name of the file to look for.
Help

https://symfony.com/doc/2.0/components/config/resources.html#locating-resources

The name of the file to look for.
Translator

What is the first argument of the constructor of Symfony\Component\Translation\Translator
Correct
- The locale
The choices were
- A translator provider
- The translation directory
- A translator loader
- The locale
Help
- https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Translation/Translator.php#L72
The locale
Node class property

When writing a Twig_Test, what is a node_class for?
Correct
- The given test will be compiled into PHP primitives.
The choices were
- The given test will rely on a custom Twig_NodeVisitorInterface.
- The given test will use a semantic validation in addition to the basic evaluation.
- The node_class is a mandatory option to get defined in a Twig_Environment.
- The given test will be compiled into PHP primitives.
Help

https://twig.symfony.com/doc/2.x/advanced.html#tests

The given test will be compiled into PHP primitives.
PSR-0

What is true about the PSR-0: Autoloading Standard?
Wrong
- The fully qualified class name MUST have one or more sub-namespace names.
- PSR-0 is compatible with PEAR-style classnames.
- The autoloader is registered with the spl_autoload_register() function.
The choices were
- PSR-0 is deprecated.
- PSR-0 is compatible with PEAR-style classnames.
- The autoloader is registered with the spl_autoload_register() function.
- The fully qualified class name MUST have one or more sub-namespace names.
Help

The fully qualified class name MAY have one or more sub-namespace names.

https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
Run

What is returned by the run() method of Symfony\Component\Process\Process?
Correct
- The exit status code
The choices were
- The exit status code
- Nothing
- 1
- true or false
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Process/Process.php#L168

The exit status code
Kernel class

What are the arguments of the Symfony\Component\HttpKernel\Kernel constructor?
Correct
- The environment name of the application.
- Whether to enable debugging or not.
The choices were
- Whether to enable caching or not.
- The environment name of the application.
- Whether to enable debugging or not.
- The name of the application.
- Whether to enable logging or not.
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpKernel/Kernel.php

The environment name of the application. Whether to enable debugging or not.
Console

Given the context where a command define three questions to ask and the following command test case is created to test it:
```
use Symfony\Component\Console\Tester\CommandTester;
class CommandTest
{
  public function testExecute(): void
  {
    // ...
    $commandTester = new CommandTester($command);
    $commandTester->setInputs(['foo', 'bar']);
    $commandTester->setInputs(['one']);
    // ...
    $commandTester->execute(['command' => $command->getName()]);
    // ...
  }
}
```
Which values will be received as answers to the command interactive questions ?
Correct
- The command will receive foo as answer to its first question and bar as answer to its second question
The choices were
- The command will receive one as answer to its first question and bar as answer to its second question
- An exception will be thrown
- The command will receive foo as answer to its first question and bar as answer to its second question
Help

https://symfony.com/doc/3.2/components/console/helpers/questionhelper.html

The command will receive foo as answer to its first question and bar as answer to its second question

Console

Given the following console event subscriber:

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Console\ConsoleEvents;
class ConsoleListener implements EventSubscriberInterface
{
  private AppChecker $appChecker;
  public function __construct(AppChecker $appChecker)
  {
    $this->appChecker = $appChecker;
  }
  public function onTerminate(ConsoleEvent $event): void
  {
    if (!$this->appChecker->isOk()) {
      $event->getCommand()->setCode(232);
    }
  }
  public static function getSubscribedEvents(): array
  {
    return [
        ConsoleEvents::TERMINATE => 'onTerminate'
    ];
  }
}

What can be said about the setCode command method ?

The code above will result to an error

This method doesn't exist
The code above will result to an error
The code above will change the command exit status code to 232

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Console/Command/Command.php#L252

The code above will result to an error

Dynamic filters

We assume using a filter in a template with:
```
{{ 'foo'|a_path_b }}
```
Twig
with the filter definition:
```
$filter = new TwigFilter('*_path_*', function (???) {
    // ...
});
```
How the arguments will be passed to the callable ?
Correct
- The callable function will be called with the given parameters respectively:
  
  ('a', 'b', 'foo')
The choices were
- The callable function will be called with the given parameters respectively:
  
  ('foo', ['a', 'b'])
- The callable function will be called with the given parameters respectively:
  
  ('foo', ['patterns' => ['a', 'b']])
- The callable function will be called with the given parameters respectively:
  
  ('foo', 'a', 'b')
- The callable function will be called with the given parameters respectively:
  
  ('a', 'b', 'foo')
Help

https://twig.symfony.com/doc/2.x/advanced.html#dynamic-filters

The callable function will be called with the given parameters respectively: ('a', 'b', 'foo')
Twig Internals

Which of the following Twig internal objects is responsible for converting a tokens stream into a meaningful tree of nodes (aka AST or Abstract Syntax Tree)?
Correct
- The Parser
The choices were
- The Compiler
- The Parser
- The Lexer
- The Environment
Help

https://twig.symfony.com/doc/1.x/internals.html

The Parser
Twig Internals

Which of the following Twig internal objects is responsible for transforming an AST (Abstract Syntax Tree) into PHP code?
Wrong
- The Parser
The choices were
- The Environment
- The Lexer
- The Parser
- The Compiler
Help

http://twig.symfony.com/doc/internals.html
Node compilation

The Compiler is used to transform a Node into a valid PHP class, but which class actually call the compiler?
Correct
- The Node
The choices were
- The Node
- The Lexer
- The Compiler
- The Environment
Help
The Node
Node compilation

The Compiler is used to transform a Node into a valid PHP class, but which class actually calls the compiler?
Correct
- The Node
The choices were
- The Compiler
- The Node
- The Environment
- The Lexer
Help
The Node
Twig Internals

Which of the following Twig internal objects is responsible for tokenizing the template source code into smaller pieces for easier processing?
Correct
- The Lexer
The choices were
- The Environment
- The Lexer
- The Compiler
- The Parser
Help

http://twig.symfony.com/doc/internals.html

The Lexer
Twig Internals

Which of the following Twig internal objects is responsible for transforming an AST (Abstract Syntax Tree) into PHP code?
Wrong
- The Lexer
The choices were
- The Parser
- The Environment
- The Lexer
- The Compiler
Help

http://twig.symfony.com/doc/internals.html
Core Symfony

In a Symfony application, what is the element that links the core components together ?
Correct
- The FrameworkBundle.
The choices were
- The FrameworkBundle.
- The Container.
- The Kernel.
Help
- https://symfony.com/components/Framework%20Bundle
The FrameworkBundle.
FlashBag usage

Which statement is true about FlashBag::add() and FlashBag::set()?
Correct
- The FlashBag::add() method allow to add a single message while FlashBag::set() allow to add a set of messages while overriding the existing ones
The choices were
- The FlashBag::add() method allow to add a set of messages while FlashBag::set() allow to add a single message
- They behave the same way
- The FlashBag::add() method allow to add a single message while FlashBag::set() allow to add a set of messages while overriding the existing ones
- The FlashBag::add() method allow to add a single message while FlashBag::set() allow to add a set of message using a callback
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/HttpFoundation/Session/Flash/FlashBag.php

The FlashBag::add() method allow to add a single message while FlashBag::set() allow to add a set of messages while overriding the existing ones
Validator API

Consider the following code snippet:
```
$result = $validator->validate($someObject);
```
What will be the expected outcome when running this piece of code?
Correct
- The $result variable will contain a valid implementation of the Symfony\Component\Validator\ConstraintViolationListInterface interface.
The choices were
- The $result variable will contain a simple boolean value (true or false).
- The validate method will throw a Symfony\Component\Validator\Exception\ValidatorException exception if the given object's state doesn't match its mapped validation constraint rules.
- The $result variable will contain a valid implementation of the Symfony\Component\Validator\ConstraintViolationListInterface interface.
- The $result variable will contain an array of Symfony\Component\Validator\ConstraintViolation instances.
- The $result variable will contain null because the validate method must always return void.
Help

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Validator/ConstraintViolationList.php https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Validator/Validator/ValidatorInterface.php

The $result variable will contain a valid implementation of the Symfony\Component\Validator\ConstraintViolationListInterface interface.
Service

Which mechanism allows to aggregate services by domain in the service container?
Correct
- Tag
The choices were
- Scope
- Abstraction
- Tag
- Listener
Help
- https://symfony.com/doc/current/reference/dic_tags.html
- https://symfony.com/doc/current/components/dependency_injection/tags.html
Tag
Services subscription

Which interface must be implemented to configure a service locator?
Correct
- Symfony\Contracts\Service\ServiceSubscriberInterface
The choices were
- Symfony\Components\DependencyInjection\ServiceSubscriberInterface
- Symfony\Contracts\DependencyInjection\ServiceLocatorSubscriberInterface
- Symfony\Contracts\Service\ServiceSubscriberInterface
- Symfony\Contracts\DependencyInjection\ServiceSubscriberInterface
Help
- https://symfony.com/doc/5.0/service_container/service_subscribers_locators.html#defining-a-service-subscriber
- https://github.com/symfony/symfony/blob/5.0/src/Symfony/Contracts/Service/ServiceSubscriberInterface.php
Symfony\Contracts\Service\ServiceSubscriberInterface
Write

What is the method to transform a PHP array into a YAML representation?
Wrong
- Symfony\Component\Yaml\Yaml::write
The choices were
- Symfony\Component\Yaml\Yaml::write
- Symfony\Component\Yaml\Yaml::dump
- Symfony\Component\Yaml\Yaml::yaml
- Symfony\Component\Yaml\Yaml::toYaml
Help

https://symfony.com/doc/2.3/components/yaml/introduction.html#writing-yaml-files
Exception

What is the exception class used when an error occurs during parsing with Symfony\Component\Yaml\Yaml::parse method?
Correct
- Symfony\Component\Yaml\Exception\ParseException
The choices were
- Symfony\Component\Yaml\Exception\ParsingException
- Symfony\Component\Yaml\ParsingException
- Symfony\Component\Yaml\Exception\ParseException
- Symfony\Component\Yaml\ParseException
Help
- http://symfony.com/doc/current/components/yaml/introduction.html#reading-yaml-files
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Yaml/Exception/ParseException.php
Symfony\Component\Yaml\Exception\ParseException
ValidatorInterface::validate return

What is the return type of the Symfony\Component\Validator\Validator\ValidatorInterface::validate method?
Correct
- Symfony\Component\Validator\ConstraintViolationListInterface
The choices were
- array<string>
- array<Symfony\Component\Validator\ConstraintViolationInterface>
- Doctrine\Common\Collections\Collection<Symfony\Component\Validator\ConstraintViolationInterface>
- Symfony\Component\Validator\ConstraintViolationListInterface
Help

https://github.com/symfony/symfony/blob/de9b7e53148d5ba4242f24bdd47f184bbfe10691/src/Symfony/Component/Validator/Validator/ValidatorInterface.php#L36

Symfony\Component\Validator\ConstraintViolationListInterface
Listener

What is the listener that handles security exceptions and when appropriate, helps the user to authenticate?
Correct
- Symfony\Component\Security\Http\Firewall\ExceptionListener
The choices were
- Symfony\Component\Security\Http\Firewall\SecurityListener
- Symfony\Component\Security\Http\Firewall\AuthenticationListener
- Symfony\Component\Security\Http\Firewall\AuthListener
- Symfony\Component\Security\Http\Firewall\ExceptionListener
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/Security/Http/Firewall/ExceptionListener.php

Symfony\Component\Security\Http\Firewall\ExceptionListener
LanguageType choices

By default, which function provides the choices of the Symfony\Component\Form\Extension\Core\Type\LanguageType form type?
Correct
- Symfony\Component\Intl\Languages::getNames()
The choices were
- Symfony\Component\Intl\Languages::getNames()
- Symfony\Component\Intl\Intl::getLanguageBundle()->getLanguageNames()
- Symfony\Component\Form\Extension\Core\Type\LanguageType::getChoices()
- Intl::getLanguages()
Help

https://symfony.com/doc/4.3/reference/forms/types/language.html#choices

Symfony\Component\Intl\Languages::getNames()

Kernel Version

How to get the kernel version?

Symfony\Component\HttpKernel\Kernel::getVersion()

Symfony\Component\HttpKernel\Kernel::getVersion()

Symfony\Component\HttpKernel\Kernel::VERSION

```
$kernel->getVersion();
```
It's not possible

Symfony\Component\HttpKernel\Kernel::VERSION_ID

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpKernel/Kernel.php#L61

Event

What is the base class for events thrown in the HttpKernel component.
Correct
- Symfony\Component\HttpKernel\Event\KernelEvent
The choices were
- Symfony\Component\HttpKernel\Event\HttpKernelEvent
- Symfony\Component\HttpKernel\HttpKernelEvent
- Symfony\Component\HttpKernel\BaseKernelEvent
- Symfony\Component\HttpKernel\KernelEvent
- Symfony\Component\HttpKernel\Event\BaseKernelEvent
- Symfony\Component\HttpKernel\Event\KernelEvent
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpKernel/Event/KernelEvent.php
Symfony\Component\HttpKernel\Event\KernelEvent
Mocking the session

Which classes exist to help you test some code that is using a Symfony\Component\HttpFoundation\Session\Session object?
Wrong
- Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage
- Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage
- Symfony\Component\HttpFoundation\Session\Storage\MockSessionStorage
The choices were
- Symfony\Component\HttpFoundation\Session\Storage\MockMemorySessionStorage
- Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage
- Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage
- Symfony\Component\HttpFoundation\Session\Storage\MockDatabaseSessionStorage
- Symfony\Component\HttpFoundation\Session\Storage\MockSessionStorage
Help

https://symfony.com/doc/2.3/components/http_foundation/session_testing.html
Symfony Requests

In which namespace does the Request object live ?
Correct
- Symfony\Component\HttpFoundation
The choices were
- Symfony\Component\HttpClient
- Symfony\Component\HttpFoundation
- \ (built in class)
- Symfony\Component\HttpKernel
Help
- https://symfony.com/doc/current/components/http_foundation.html
Symfony\Component\HttpFoundation
TextType children

Which of these form types does not inherit from the Symfony\Component\Form\Extension\Core\Type\TextType type ?
Wrong
- Symfony\Component\Form\Extension\Core\Type\PasswordType
- Symfony\Component\Form\Extension\Core\Type\LocaleType
- Symfony\Component\Form\Extension\Core\Type\HiddenType
- Symfony\Component\Form\Extension\Core\Type\RangeType
- Symfony\Component\Form\Extension\Core\Type\SearchType
The choices were
- Symfony\Component\Form\Extension\Core\Type\HiddenType
- Symfony\Component\Form\Extension\Core\Type\PasswordType
- Symfony\Component\Form\Extension\Core\Type\RangeType
- Symfony\Component\Form\Extension\Core\Type\LocaleType
- Symfony\Component\Form\Extension\Core\Type\SearchType
Help

https://symfony.com/doc/current/reference/forms/types.html
BirthdayType parent.

Which of the following form types is the parent of the Symfony\Component\Form\Extension\Core\Type\BirthdayType form type ?
Correct
- Symfony\Component\Form\Extension\Core\Type\DateType
The choices were
- Symfony\Component\Form\Extension\Core\Type\DateTimeType
- Symfony\Component\Form\Extension\Core\Type\TimeType
- Symfony\Component\Form\Extension\Core\Type\DateType
Help

http://symfony.com/doc/current/reference/forms/types/birthday.html

Symfony\Component\Form\Extension\Core\Type\DateType
ChoiceType choice_loader option

Which interface should be implemented when you want to set the choice_loader option of the Symfony\Component\Form\Extension\Core\Type\ChoiceType form type ?
Wrong
- Symfony\Component\Form\Extension\Core\ChoiceLoaderInterface
The choices were
- Symfony\Component\Form\ChoiceLoaderInterface
- Symfony\Component\Form\Extension\Core\ChoiceLoaderInterface
- Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface
Help

http://symfony.com/doc/current/reference/forms/types/choice.html#choice-loader
"Tester" command class

Which Tester class should you use to test a console event (e.g. the ConsoleEvents::TERMINATE event)?
Wrong
- Symfony\Component\Console\Tester\CommandTester
The choices were
- Symfony\Component\Console\Tester\ApplicationTester
- Symfony\Component\Console\Tester\CommandTester
- Symfony\Component\Console\Tester\CommandCompletionTester
Help

https://symfony.com/doc/current/console.html#testing-commands
Default option's mode

Given the following definition:
```
new InputOption('foo', 'f')
```
What is the foo option's mode?
Wrong
- Symfony\Component\Console\Input\InputOption::VALUE_OPTIONAL
The choices were
- Symfony\Component\Console\Input\InputOption::VALUE_IS_ARRAY
- Symfony\Component\Console\Input\InputOption::VALUE_OPTIONAL
- Symfony\Component\Console\Input\InputOption::VALUE_REQUIRED
- Symfony\Component\Console\Input\InputOption::VALUE_NEGATABLE
- Symfony\Component\Console\Input\InputOption::VALUE_NONE
Help

https://github.com/symfony/console/blob/2.3/Input/InputOption.php#L32
InputOption constants

Which of the following constants exist?
Correct
- Symfony\Component\Console\Input\InputOption::VALUE_NONE
- Symfony\Component\Console\Input\InputOption::VALUE_OPTIONAL
- Symfony\Component\Console\Input\InputOption::VALUE_REQUIRED
- Symfony\Component\Console\Input\InputOption::VALUE_IS_ARRAY
- Symfony\Component\Console\Input\InputOption::VALUE_NEGATABLE
The choices were
- Symfony\Component\Console\Input\InputOption::VALUE_NONE
- Symfony\Component\Console\Input\InputOption::VALUE_IS_ARRAY
- Symfony\Component\Console\Input\InputOption::VALUE_NEGATABLE
- Symfony\Component\Console\Input\InputOption::VALUE_OPTIONAL
- Symfony\Component\Console\Input\InputOption::VALUE_REQUIRED
Help

https://github.com/symfony/console/blob/6.0/Input/InputOption.php https://symfony.com/doc/6.0/console/input.html#using-command-options

Symfony\Component\Console\Input\InputOption::VALUE_NONE Symfony\Component\Console\Input\InputOption::VALUE_OPTIONAL Symfony\Component\Console\Input\InputOption::VALUE_REQUIRED Symfony\Component\Console\Input\InputOption::VALUE_IS_ARRAY Symfony\Component\Console\Input\InputOption::VALUE_NEGATABLE
InputArgument constants

Which of the following constants do not exist?
Wrong
- Symfony\Component\Console\Input\InputArgument::IS_ARRAY
- Symfony\Component\Console\Input\InputArgument::REQUIRED
- Symfony\Component\Console\Input\InputArgument::OPTIONAL
The choices were
- Symfony\Component\Console\Input\InputArgument::REQUIRED
- Symfony\Component\Console\Input\InputArgument::NEGATABLE
- Symfony\Component\Console\Input\InputArgument::IS_ARRAY
- Symfony\Component\Console\Input\InputArgument::NONE
- Symfony\Component\Console\Input\InputArgument::OPTIONAL
Help

https://github.com/symfony/console/blob/6.0/Input/InputArgument.php#L24-L26 https://symfony.com/doc/6.0/console/input.html#using-command-arguments
Console events

Which of these events are not built-in?
Wrong
- Symfony\Component\Console\ConsoleEvents::TERMINATE
- Symfony\Component\Console\ConsoleEvents::COMMAND
- Symfony\Component\Console\ConsoleEvents::ERROR
The choices were
- Symfony\Component\Console\ConsoleEvents::HANDLE_COMMAND
- Symfony\Component\Console\ConsoleEvents::TERMINATE
- Symfony\Component\Console\ConsoleEvents::COMMAND
- Symfony\Component\Console\ConsoleEvents::VIEW
- Symfony\Component\Console\ConsoleEvents::ERROR
Help
- https://symfony.com/doc/4.0/components/console/events.html
Console events

Which of these events are not built-in?
Wrong
- Symfony\Component\Console\ConsoleEvents::ERROR
- Symfony\Component\Console\ConsoleEvents::VIEW
- Symfony\Component\Console\ConsoleEvents::HANDLE_COMMAND
The choices were
- Symfony\Component\Console\ConsoleEvents::HANDLE_COMMAND
- Symfony\Component\Console\ConsoleEvents::TERMINATE
- Symfony\Component\Console\ConsoleEvents::VIEW
- Symfony\Component\Console\ConsoleEvents::COMMAND
- Symfony\Component\Console\ConsoleEvents::ERROR
Help
- https://symfony.com/doc/4.0/components/console/events.html
HttpClient

Which abstraction HTTPClient is interoperable with?
Correct
- Symfony contracts
- HTTPlug v2
- HTTPlug v1
- PSR-18
The choices were
- HTTPlug v1
- HTTPlug v2
- PSR-18
- Symfony contracts
Help
- https://symfony.com/doc/5.0/components/http_client.html
Symfony contracts HTTPlug v2 HTTPlug v1 PSR-18
Available Response Classes.

Which of the following are valid Symfony response classes extending the base Symfony\Component\HttpFoundation\Response class?
Correct
- StreamedResponse
- BinaryFileResponse
- RedirectResponse
- JsonResponse
The choices were
- ImageFileResponse
- StreamedResponse
- BinaryResponse
- ImageResponse
- RedirectedResponse
- FileResponse
- StreamResponse
- JsonResponse
- BinaryFileResponse
- NotFoundResponse
- RedirectResponse
Help
StreamedResponse BinaryFileResponse RedirectResponse JsonResponse

Response Structure

What is the Response structure ?

Status-Line CRLF
Headers CRLF
CRLF
Message-body

```
Status-Line
Headers CRLF
Message-body
```

Status-Line CRLF
Headers CRLF
CRLF
Message-body

```
Status-Line
Headers
Message-body
```

Status-Line
CRLF
Headers
CRLF
Message-body

https://datatracker.ietf.org/doc/html/rfc2616#section-6

Status-Line CRLF Headers CRLF CRLF Message-body

Output buffering

Which of the following operations must occur prior to any output being sent to the client (assuming output buffering is disabled)
Wrong
- Starting a session
The choices were
- Modifying session data
- Starting a session
- Sending HTTP Headers
- Processing GET and POST data
- Manipulating Cookie data
Help

https://www.php.net/manual/en/function.header.php
Service

What is the way to always get a new instance of a service?
Correct
- Setting the option shared to false.
The choices were
- Setting the option scope to prototype.
- Setting the option shared to false.
- Setting the option singleton to false.
- Setting the option scope to request.
- By passing an instance of the CompilerPass to the pushCompilerPass of a ContainerBuilder.
Help
- https://symfony.com/doc/current/cookbook/service_container/shared.html
Setting the option shared to false.
Injection Types

What are the recommended types of injections when injecting a service dependency into another?
Wrong
- Setter injection
- Constructor injection
- Property injection
- Immutable-setter Injection
The choices were
- Setter injection
- Immutable-setter Injection
- Property injection
- Constructor injection
- Getter injection
Help
- https://symfony.com/doc/7.0/service_container/injection_types.html
- Immutable-setter Injection was introduced in 4.3
- using property injection is not recommanded
Built-In Value Resolvers

Which of the following value resolvers are shipped with the HttpKernel component?
Wrong
- SessionValueResolver
- RequestValueResolver
- UserValueResolver
The choices were
- RequestValueResolver
- VariadicValueResolver
- DefaultValueResolver
- SessionValueResolver
- ServiceValueResolver
- RequestAttributeValueResolver
- UserValueResolver
Help

https://symfony.com/doc/current/controller/argument_value_resolver.html#built-in-value-resolvers
Service access

Which exception is thrown when a service is not defined while using ContainerInterface::get()?
Wrong
- ServiceUndefinedException
The choices were
- ServiceGetException
- UndefinedServiceException
- ServiceUnavailableException
- ServiceUndefinedException
- ServiceNotFoundException
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/Container.php#L221

PHP streams

What does this script do ?

$opts = [ 'http' =>
               [ 'method' => 'POST',
                 'header' => 'Content-Type: application/x-www-form-urlencoded',
                 'content' => 'a=foo&b=bar'
               ]
         ];
$ctx = stream_context_create($opts);
file_get_contents('http://myserver/page.php', false, $ctx);

Sends a form to a server

A classical Web request to a server
Display a webpage into an other
Sends a form to a server
Reads the content of a webpage and store in into a file

Sends a form to a server

Validation constraints

Which of the followings are not validation constraints?
Wrong
- Search
- File
The choices were
- All
- File
- Search
- Password
Help
- http://symfony.com/doc/current/reference/constraints.html
Process status

What are the availables process status constants in the Symfony\Component\Process\Process class ?
Correct
- STATUS_STARTED
- STATUS_READY
- STATUS_TERMINATED
The choices were
- STATUS_STARTED
- STATUS_READY
- STATUS_FAILED
- STATUS_TERMINATED
- STATUS_SENT
- STATUS_STOPPED
- STATUS_INITIALIZED
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/Process/Process.php#L29

STATUS_STARTED STATUS_READY STATUS_TERMINATED
Security

Which protocols secure HTTP?
Correct
- SSL
- TLS
The choices were
- SSL
- SMTP
- TLS
- SSH
Help
- https://tools.ietf.org/html/rfc2818
- https://tools.ietf.org/html/rfc6101
SSL TLS
Route compilation

Which exception is thrown when a Route defined with /page/{foo}/{foo} cannot be compiled?
Wrong
- RouteCompilationException
The choices were
- LogicException
- RouteCompilationException
- RuntimeException
- InvalidRouteCompilationContextException
- InvalidArgumentException
Help

https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Routing/RouteCompiler.php#L39
FormRegistry usage

Which type is returned by FormRegistry::getType()?
Correct
- ResolvedFormTypeInterface
The choices were
- ResolvedFormTypeInterface
- FormInterface
- ResolvedForm
- GuessedType
Help
- https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Form/FormRegistry.php#L60
ResolvedFormTypeInterface
Request Structure

What is the request structure ?
Correct
- Request-Line CRLF Headers CRLF CRLF Body
The choices were
- Request-Line Headers CRLF Body
- Request-Line CRLF Headers CRLF CRLF Body
- Request-Line Headers CRLF CRLF Body
- Request-Line
  
  Headers
  
  Body
Help

https://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html

Request-Line CRLF Headers CRLF CRLF Body
Template controller

What is the main purpose of the built-in Symfony\Bundle\FrameworkBundle\Controller:TemplateController controller?
Correct
- Render templates that do not require a controller, such as static pages.
The choices were
- Render templates that do not require a controller, such as static pages.
- Render custom error templates.
- Extract translation keys/strings from templates.
- Provide information about the template being rendered for the profiler.
Help
- https://symfony.com/doc/current/cookbook/templating/render_without_controller.html
Render templates that do not require a controller, such as static pages.
Role

Which ROLE allows you to impersonate a user?
Correct
- ROLE_ALLOWED_TO_SWITCH
The choices were
- ROLE_ADMIN_ALLOWED_TO_SWITCH
- ROLE_ADMIN
- ROLE_ALLOWED_TO_SWITCH
- ROLE_USER_ALLOWED_TO_SWITCH
Help
- http://symfony.com/doc/current/security/impersonating_user.html
ROLE_ALLOWED_TO_SWITCH
SecurityBundle

Given the following access_control configuration:
```
access_control:
    - { path: ^/profile, roles: ROLE_USER, requires_channel: https }
    - { path: ^/profile, roles: ROLE_ADMIN }
```
YAML
The requested url is http://mydomain.tld/profile. Which role is needed to access to /profile ?
Wrong
- ROLE_ADMIN
The choices were
- Neither ROLE_USER nor ROLE_ADMIN, an exception is thrown
- ROLE_ADMIN
- ROLE_USER
Help

requires_channel allows to make a redirection, it's not involved in request matching
- https://symfony.com/doc/2.7/security/access_control.html
Validation constraints

Which of the following elements can contain validation constraints?
Wrong
- Public properties
- Classes
- Public getters/issers
The choices were
- Public getters/issers
- Public properties
- Private and protected getters/issers
- Classes
- Private and protected properties
Help
- https://symfony.com/doc/6.0/validation.html#getters
Interfaces

Which of the following language structures are allowed in an interface?
Wrong
- Public methods signatures.
- Traits imports.
- Public concrete methods.
- Public constants.
The choices were
- Private (or protected) methods signatures.
- Static attributes.
- Public constants.
- Traits imports.
- Public methods signatures.
- Private (or protected) constants.
- Public concrete methods.
Help

https://www.php.net/manual/en/language.oop5.interfaces.php
Interfaces

Which of the following language structures are allowed in an interface?
Wrong
- Public methods signatures.
- Private (or protected) constants.
- Public constants.
The choices were
- Public methods signatures.
- Traits imports.
- Public constants.
- Private (or protected) constants.
- Private (or protected) methods signatures.
- Static attributes.
- Public concrete methods.
Help

https://www.php.net/manual/en/language.oop5.interfaces.php
Attributes and Methods Scopes

Which of the following are supported visibilities for class attributes and methods in PHP ?
Correct
- Protected
- Private
- Public
The choices were
- Global
- Private
- Public
- Protected
- Friend
Help

http://php.net/manual/en/language.oop5.visibility.php

Protected Private Public
Object definitions

How do you call a variable defined at an object level ?
Correct
- Property
The choices were
- Attribute
- ClassVar
- Argument
- Property
Help
- https://www.php.net/manual/en/language.oop5.properties.php
Property
Console helpers

What are the console helpers ?
Correct
- Process helper
- Question helper
- Formatter helper
The choices were
- Process helper
- Answer helper
- Formatter helper
- Validator helper
- Question helper
- Dialog helper
Help

https://symfony.com/doc/5.0/components/console/helpers/index.html

Process helper Question helper Formatter helper
Console Script

What is the format of the bin/console file?
Correct
- Plain PHP script
The choices were
- Binary file
- Plain PHP script
- PHAR file
- Self-executable compressed file
Help
- https://github.com/symfony/recipes/blob/main/symfony/console/5.3/bin/console#L1-L2
Plain PHP script
Redirection

What does the 308 HTTP status code stand for?
Correct
- Permanent redirect
The choices were
- Temporary redirect
- Permanent redirect
- Found (moved temporarily)
- Moved permanently
Help
- https://tools.ietf.org/html/rfc7538
Permanent redirect
Usage

Which method is used to generate an hashed password?
Correct
- PasswordHasherInterface::hash
The choices were
- PasswordHasherInterface::new
- PasswordHasherInterface::encode
- PasswordHasherInterface::hash
- PasswordHasherInterface::crypt
Help

https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/PasswordHasher/PasswordHasherInterface.php

PasswordHasherInterface::hash
Clock PSR

Which PSR described a common interface for reading the system clock, implemented by the Clock component since Symfony 6.2?
Correct
- PSR-20
The choices were
- PSR-20
- PSR-8
- PSR-4
- PSR-17
Help

https://www.php-fig.org/psr/psr-20/

PSR-20

Form events

Which event listeners can the following form have?

<?php
namespace App\Form\Type;
// ...
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
// ...
class LocationType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('address', TextareaType::class)
            ->add('zipcode', TextType::class)
            ->add('city', TextType::class)
            ->add('country', TextType::class);
    }
    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => Location::class,
            'inherit_data' => true,
        ]);
    }
}

POST_SUBMIT
PRE_SUBMIT
SUBMIT
POST_SET_DATA
PRE_SET_DATA

PRE_SUBMIT
PRE_SET_DATA
POST_SUBMIT
SUBMIT
POST_SET_DATA

https://symfony.com/doc/current/form/inherit_data_option.html

Safe HTTP verbs.

Which HTTP verbs are safe ?
Wrong
- POST
- DELETE
- PUT
- GET
- PATCH
The choices were
- OPTIONS
- HEAD
- DELETE
- COPY
- GET
- PUT
- POST
- LINK
- PATCH
- TRACE
Help
- https://tools.ietf.org/html/rfc7231#section-4.2.1
- https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Safe_methods
HTTP method

Consider the following HTML generated from a Symfony form:
```
<form method="POST" action="/">
    <input type="hidden" name="_method" value="PUT" />
</form>
```
HTML
Which HTTP method will be present in the Symfony Request object assuming HTTP methods overriding setting is turned on?
Wrong
- POST
The choices were
- PATCH
- GET
- PUT
- POST
Help
- https://symfony.com/doc/4.1/form/action_method.html (see "Note" at the bottom of the page)
PHP version

Since which PHP version can you use anonymous functions ?
Correct
- PHP 5.3
The choices were
- PHP 5.5
- PHP 5.3
- PHP 7.0
- PHP 5.4
- PHP 5.6
Help
- https://www.php.net/manual/en/functions.anonymous.php
- https://www.php.net/ChangeLog-5.php#PHP_5_3
PHP 5.3
Http methods

Which of these methods aren't mentioned as commonly implemented in the RFC7231 (previously RFC2616 ?
Correct
- PATCH
- LINK
The choices were
- TRACE
- LINK
- CONNECT
- PATCH
Help

https://datatracker.ietf.org/doc/html/rfc7231#section-4.3

PATCH LINK
Verbosity

What are the console verbosity levels?
Correct
- ```
OutputInterface::VERBOSITY_QUIET
```
- ```
OutputInterface::VERBOSITY_VERBOSE
```
- ```
OutputInterface::VERBOSITY_DEBUG
```
- ```
OutputInterface::VERBOSITY_NORMAL
```
- ```
OutputInterface::VERBOSITY_VERY_VERBOSE
```
The choices were
- ```
OutputInterface::VERBOSITY_VERBOSE
```
- ```
OutputInterface::VERBOSITY_NO_DEBUG
```
- ```
OutputInterface::VERBOSITY_VERY_VERBOSE
```
- ```
OutputInterface::VERBOSITY_DEBUG
```
- ```
OutputInterface::VERBOSITY_QUIET
```
- ```
OutputInterface::VERBOSITY_NONE
```
- ```
OutputInterface::VERBOSITY_VERY_VERY_VERBOSE
```
- ```
OutputInterface::VERBOSITY_NORMAL
```
Help
- http://symfony.com/doc/current/console/verbosity.html
OutputInterface::VERBOSITY_QUIETPHP OutputInterface::VERBOSITY_VERBOSEPHP OutputInterface::VERBOSITY_DEBUGPHP OutputInterface::VERBOSITY_NORMALPHP OutputInterface::VERBOSITY_VERY_VERBOSEPHP
Options deprecations

If you define an option as deprecated thanks to OptionsResolver::setDeprecated(), when will the deprecation message appear?
Correct
- Only if the option is provided by the user
The choices were
- When running tests
- Only if the option is provided by the user
- Always
Help

https://symfony.com/doc/current/components/options_resolver.html#deprecating-the-option

Only if the option is provided by the user
Security

Which sentences are true about security events ?
Correct
- On a session-based authentication, the security.authentication.success is dispatched on each page when the user is authenticated
- security.authentication.failure is launched when an authentication attempt fails
The choices were
- security.logout_on_change is triggered when the user use the logout feature of the firewall
- On a session-based authentication, the security.authentication.success is dispatched on each page when the user is authenticated
- When you log in via an http basic header, a security.interactive_login event is triggered
- security.authentication.failure is launched when an authentication attempt fails
Help
- https://symfony.com/doc/4.3/components/security/authentication.html
On a session-based authentication, the security.authentication.success is dispatched on each page when the user is authenticated security.authentication.failure is launched when an authentication attempt fails
Security

Which sentences are true about security events?
Correct
- On a session-based authentication, the security.authentication.success is dispatched on each page when the user is authenticated
- security.authentication.failure is launched when an authentication attempt fails
The choices were
- When you log in via an http basic header, a security.interactive_login event is triggered
- security.authentication.failure is launched when an authentication attempt fails
- On a session-based authentication, the security.authentication.success is dispatched on each page when the user is authenticated
- security.logout_on_change is triggered when the user use the logout feature of the firewall
Help

https://symfony.com/doc/4.x/components/security/authentication.html#authentication-events

On a session-based authentication, the security.authentication.success is dispatched on each page when the user is authenticated security.authentication.failure is launched when an authentication attempt fails
Normalizers

Which of the followings are built-in normalizers?
Correct
- ObjectNormalizer
- DataUriNormalizer
- GetSetMethodNormalizer
- DateTimeNormalizer
- CustomNormalizer
The choices were
- GetSetMethodNormalizer
- DateTimeNormalizer
- JsonNormalizer
- CustomNormalizer
- DataUriNormalizer
- XmlNormalizer
- DateNormalizer
- TimeNormalizer
- ObjectNormalizer
Help
- https://github.com/symfony/symfony/tree/3.1/src/Symfony/Component/Serializer/Normalizer
ObjectNormalizer DataUriNormalizer GetSetMethodNormalizer DateTimeNormalizer CustomNormalizer
mkdir

What is returned by the Symfony\Component\Filesystem\Filesystem::mkdir method if the directory has been successfully created ?
Correct
- Nothing
The choices were
- true or false
- A string with the directory path
- The FileSystem object
- Nothing
Help
- https://symfony.com/doc/2.7/components/filesystem.html#mkdir
- https://github.com/symfony/filesystem/blob/2.7/Filesystem.php#L85
Nothing
Assertions

Given an object Foo which implements \Countable and the method count() which return 1, what will be displayed?
```
{% if foo is empty %}
    {{ foo.get('name') }}
{% endif %}
```
Twig
Correct
- Nothing
The choices were
- The value of foo.get('name')
- Nothing
Help

https://twig.symfony.com/doc/1.x/tests/empty.html

Nothing

Array functions

What is the output of the following PHP script?

<?php
$values = [
    15,
    12,
    '15',
    34,
    15 => 25
];
$key = array_search('15', $values);
if (!$key) {
    echo "Not found";
} else {
    // gettype() will return either 'string' or 'integer'
    echo $key . ' - ' . strtolower(gettype($values[$key]));
}

Not found

Not found
2 - string
4 - integer
0 - integer

Not found

Events usage

Which class can be used as argument when listening to kernel.controller_arguments?
Wrong
- None, this event does not exist
The choices were
- FilterControllerEvent
- FilterControllerArgumentsEvent
- None, this event does not exist
- ControllerArgumentsEvent
- ControllerEvent
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/HttpKernel/Event/ControllerArgumentsEvent.php
Finder

What is the finder service id ?
Correct
- None of them, the finder is not a service
The choices were
- None of them, the finder is not a service
- finder.iterator
- finder
- finder.finder
Help

The finder is not a service due to its stateful nature
- https://symfony.com/doc/3.3/components/finder.html#usage
None of them, the finder is not a service
The "with" tag

Given that Twig is configured with "strict_variables" set to true.

Consider the following Twig snippet:
```
{% with %}
    {% set maxItems = 7 %}
    {# ... #}
{% endwith %}
{# ... #}
{% for i in 1..maxItems %}
    {# ... #}
{% endfor %}
```
Twig
Will the Twig template work as expected?
Correct
- No. The template will display an error because the maxItems variable is not defined outside the with tag.
The choices were
- Yes
- No. The template will display an error because the maxItems variable is not defined outside the with tag.
- No. The template won't iterate from 1 to 7. It will execute the for loop just one time (where i is 1).
- No. The template will display an error because the with tag is not defined.
Help

Twig 1.28 (November 2016) introduced a new with tag that allows to create different scopes in the same template. Variables defined inside a with tag are not available outside of it. See http://twig.symfony.com/doc/tags/with.html

No. The template will display an error because the maxItems variable is not defined outside the with tag.
Button usage

Could an event subscriber be added to a Button
Correct
- No
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/ButtonBuilder.php#L181

No
Coding standards

Does the following code follow the Twig coding standard?
```
{{foo}}
```
Twig
Correct
- No
The choices were
- No
- Yes
Help

https://twig.symfony.com/doc/1.x/coding_standards.html

No
Safe usage

Is the Safe header considered as a secure mechanism?
Correct
- No
The choices were
- Yes
- No
Help

https://datatracker.ietf.org/doc/html/rfc8674#name-security-considerations

No
`render_esi`

Does the render_esi Twig function throw an exception when the request is not coming from a gateway cache?
Correct
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/6.0/http_cache/esi.html

No
Route compilation

Could a Route defined with /page/{foo}/{foo} path be compiled?
Correct
- No
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Routing/RouteCompiler.php#L39
- https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Routing/RouteCompiler.php#L137
No
Listener usage

Could a button receive an event listener?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/ButtonBuilder.php#L176

No
Helpers

Could you use Helper::strlen() to obtain the length of a string?
Correct
- No
The choices were
- Yes
- No
Help
- https://github.com/symfony/symfony/blob/5.4/UPGRADE-6.0.md#console
- https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Console/Helper/Helper.php
- The Helper::strlen() method has been removed, consider using Helper::width() or Helper::length() instead.
No
Session access

Does the session service still available?
Correct
- No
The choices were
- Yes
- No
Help
- https://github.com/symfony/symfony/blob/5.4/UPGRADE-6.0.md#frameworkbundle
- The session alias has been deprecated, consider using Request::getSession() or RequestStack::getSession() instead.
No
Template Inheritance

Is this Twig template valid ?
```
<h1>{{ title }}</h1>
{% extends 'base.html.twig' %}
{% block content %}
    <p>{{ content }}</p>
{% endblock %}
```
Twig
Correct
- No
The choices were
- No
- Yes
Help
No

The NotBlank validation constraint

Will the following snippet throw an InvalidArgumentException ?

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints\NotBlank;
$expectedNotBlank = "0";
$validator = Validation::createValidator();
$violations = $validator->validate($expectedNotBlank, [new NotBlank()]);
if (0 !== count($violations)) {
    throw new InvalidArgumentException('The value is blank !');
}

https://symfony.com/doc/current/reference/constraints/NotBlank.html

Safe usage

Could the safe directive be considered as a reliable indicator that the end user is a child?
Correct
- No
The choices were
- Yes
- No
Help

https://datatracker.ietf.org/doc/html/rfc8674#section-1

No
Expires usage

Given the following header, will the resource be considered as fresh?
```
Expires: 0
```
Plain text
Correct
- No
The choices were
- No
- Yes
Help
- https://datatracker.ietf.org/doc/html/rfc7234#section-5.3
- https://developer.mozilla.org/en/docs/Web/HTTP/Headers/Expires
No
Permissions

Is the following code valid?
```
<?php
use Symfony\Component\Filesystem\Filesystem;
$fs = new Filesystem();
$fs->mkdir('/srv/app', 777);
$fs->permissions('/srv/app', 775);
```
Correct
- No
The choices were
- No
- Yes
Help
- https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/Filesystem/Filesystem.php#L65
- Consider using chmod()
No
Expires usage

Is the following header value valid?
```
Expires: - 7 hours
```
Plain text
Correct
- No
The choices were
- No
- Yes
Help
No
FrozenParameterBag usage

Could a parameter be removed from a FrozenParameterBag?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php

No
Route compilation

Could a Route defined with /page/{2foo} path be compiled?
Correct
- No
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Routing/RouteCompiler.php#L39

No
Cache usage

Is it considered as a good practice to store in cache a response using the 511 status code?
Correct
- No
The choices were
- Yes
- No
Help
- https://datatracker.ietf.org/doc/html/rfc6585#section-6
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/511
No

The IsFalse validation constraint

Will the following snippet throw an InvalidArgumentException?

<?php
use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints\IsFalse;
$expectedFalse = '0';
$validator = Validation::createValidator();
$violations = $validator->validate($expectedFalse, [new IsFalse()]);
if (0 !== count($violations)) {
    throw new InvalidArgumentException('The value is not false !');
}

https://symfony.com/doc/2.3/reference/constraints/IsFalse.html

ImmutableEventDispatcher usage

Could subscribers be removed from an ImmutableEventDispatcher?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

No
Cookie creation

Could a Cookie be created from a string?
Wrong
- No
The choices were
- No
- Yes
Help
- https://symfony.com/doc/3.3/components/http_foundation.html#setting-cookies
- https://github.com/symfony/symfony/blob/3.3/src/Symfony/Component/HttpFoundation/Cookie.php
Anonymous user

It is possible to handle anonymous users in a custom voter ?
Wrong
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/current/security/authenticator_manager.html#granting-anonymous-users-access-in-a-custom-voter
Testing PHP errors

Consider the following simple PHPUnit test:
```
/**
 * @expectedException PHPUnit_Framework_Error
 */
public function testFailingInclude()
{
    include 'not_existing_file.php';
}
```
Will the previous code successfully test the error that will happen? (Note: remember that in most PHP versions, this kind of errors doesn't trigger an exception).
Wrong
- No
The choices were
- No
- Yes
Help

By default, PHPUnit converts PHP errors, warnings, and notices that are triggered during the execution of a test to an exception. See https://phpunit.de/manual/current/en/writing-tests-for-phpunit.html#writing-tests-for-phpunit.errors
ReverseContainer usage

Could a service identifier be returned from a ReverseContainer if the service is not tagged as container.reversible and defined as private?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/DependencyInjection/ReverseContainer.php

No
AttributeBag usage

Could the session.attribute_bag service be used?
Correct
- No
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/5.4/UPGRADE-6.0.md#frameworkbundle

No
Container configuration

Could the build time be configured?
Wrong
- No
The choices were
- Yes
- No
Help

https://symfony.com/doc/3.4/reference/configuration/kernel.html#container-build-time
Composer scripts

Given the context the --no-scripts option is used with composer install and the Composer version set to < 2.1, will the autoload_runtime.php file be generated?
Correct
- No
The choices were
- Yes
- No
Help

https://symfony.com/doc/5.3/components/runtime.html#usage

No
Must-understand usage

Could a response that use the must-understand directive be stored if the cache does not understand the directive?
Correct
- No
The choices were
- No
- Yes
Help

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control#directives

No
Doctrine bridge

Given the context where the doctrine transport is used, could the connection be pinged and reconnected (if closed) each time a message is handled?
Wrong
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.4/messenger.html#middleware-for-doctrine
Immutable response

Should an immutable cache-control header be used with non-secure protocol such as HTTP?
Correct
- No
The choices were
- No
- Yes
Help
- https://datatracker.ietf.org/doc/html/rfc8246
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
No
Extract usage

Should extract be used on $_GET, $_FILES and other unsecured data sources?
Correct
- No
The choices were
- No
- Yes
Help

https://www.php.net/manual/en/function.extract.php

No
Route compilation

Could a Route defined with /page/{_fragments} path be compiled?
Wrong
- No
The choices were
- No
- Yes
Help

https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Routing/RouteCompiler.php#L39
Twig template

Does this syntax perform any check?
```
{{ foo['bar'] }}
```
Twig
Wrong
- No
The choices were
- Yes, if foo is an object then if it's an array
- No
- Yes if foo is an array
Help

https://twig.symfony.com/doc/1.x/templates.html#variables
Cache usage

Could a response that use the 301 status code be cached without taking in consideration its header directives?
Wrong
- Yes
The choices were
- No
- Yes
Help
- https://datatracker.ietf.org/doc/html/rfc7231#section-6.4.2
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/301
No
Functions & filters usage

Could functions and filters be defined at runtime without any overhead?
Wrong
- No
The choices were
- Yes
- No
Help

https://twig.symfony.com/doc/1.x/recipes.html#defining-undefined-functions-and-filters-on-the-fly
Question handling

Could a hidden response be validated?
Wrong
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.5/components/console/helpers/questionhelper.html#validating-a-hidden-response
Serialization handling

Could interfaces and/or abstract classes be serialized?
Wrong
- No
The choices were
- No
- Yes
Help
- https://symfony.com/doc/4.1/components/serializer.html#serializing-interfaces-and-abstract-classes
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/Serializer/Mapping/ClassDiscriminatorResolverInterface.php
RouteCollection usage

Does using Router::getRouteCollection() considered as a best practice when checking if a route exist?
Correct
- No
The choices were
- Yes
- No
Help
- By default, if the RouteCollection is not loaded, the collection is fully loaded from the loader that trigger the cache compilation.
- https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/Routing/Router.php#L133
No
RedirectResponse

Is it possible to create a Symfony\Component\HttpFoundation\RedirectResponse with the 201 status code?
Wrong
- No
The choices were
- No
- Yes
Help
AbstractSessionListener usage

Given the AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER header directive is set, is an expiration date defined in the response?
Correct
- No
The choices were
- No
- Yes
Help
- https://symfony.com/doc/4.1/http_cache.html#http-caching-and-user-sessions
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php#L68
No
Transport setup

Are the following Mailer configuration and environment variable definition valid?
```
# .env
MAILER_DSN=smtp://u$er:$ecret@smtp.example.com:25
```
Plain text
```
# config/packages/mailer.yaml
framework:
  mailer:
    dsn: '%env(MAILER_DSN)%'
```
YAML
Correct
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.x/mailer.html#transport-setup

No
ContainerConfigurator usage

Could environment variables be configured using ContainerConfigurator?
Wrong
- No
The choices were
- No
- Yes
Help

https://github.com/symfony/dependency-injection/blob/5.3/Loader/Configurator/ContainerConfigurator.php#L198
MockHttpClient usage

Could a MockResponse be issued outside of MockHttpClient?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/HttpClient/Response/MockResponse.php#L131

No
HTTP

Does the Pragma HTTP response header allow to efficiently transmit cache instructions in HTTP/1.1 ?
Correct
- No
The choices were
- No
- Yes
Help
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Pragma
No

Safe content

Is the following code valid when returning a "safe version" of a content?

<?php
# ...
final class FooAction
{
    #[Route(path: '/', name: 'home', methods: ['GET'])
    public function __invoke(Request $request): Response
    {
        $safeContent = # ...
        if ($request->preferSafeContent()) {
            $response = new Response($safeContent);
            $response->setContentSafe();
            return $response;
        }
        return new Response(...);
    }
}

Async request

Given the following code snippet:

// ...
/** @var Symfony\Contracts\HttpClient\HttpClientInterface $client */
$response = $client->request('GET', 'http://releases.ubuntu.com/18.04.2/ubuntu-18.04.2-desktop-amd64.iso');
$this->onDownloadComplete($response);
// ...
public function onDownloadComplete(Response $response): void
{
    $this->logger->info('Download completed.');
}

Is the onDownloadComplete method guaranteed to be called when the .iso file had been downloaded completely?

https://symfony.com/doc/6.0/http_client.html#making-requests

CSRF token generation

Is the Form component required to generate a csrf token in templates?
Correct
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.1/security/csrf.html#generating-and-checking-csrf-tokens-manually

No
Service visibility

Could a service definition be hidden using setPrivate()?
Correct
- No
The choices were
- Yes
- No
Help
- https://symfony.com/doc/3.4/service_container.html#public-versus-private-services
- https://github.com/symfony/symfony/blob/3.4/src/Symfony/Component/DependencyInjection/Definition.php#L626
No
Visibilities

Is it possible for a PHP class to be declared private or protected in order to limit its scope to the current namespace only ?
Correct
- No
The choices were
- Yes
- No
Help

http://php.net/manual/en/language.oop5.visibility.php

No
Lazy services

Given the context where the ProxyManager bridge is not installed, could lazy services be defined and used as lazy services?
Correct
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.7/service_container/lazy_services.html#configuration

No
Encoders

Is the salt property needed for all encoders ?
Correct
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/2.x/reference/configuration/security.html

No
Service configurator

Could service configurators use __invoke() to configure a service?
Wrong
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/4.3/service_container/configurators.html#using-the-configurator

Ip constraint

Will the following snippet throw an InvalidArgumentException?

<?php
use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints\Ip;
$ip = "2607:f0d0:1002:51::4"; // This is a valid IPv6 address
$validator = Validation::createValidator();
$violations = $validator->validate($ip, [new Ip()]);
if (0 !== count($violations)) {
    throw new InvalidArgumentException();
}

https://symfony.com/doc/current/reference/constraints/Ip.html#version

Form - Button

Could a Button have a child?
Correct
- No
The choices were
- Yes
- No
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/ButtonBuilder.php#L84
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/Button.php#L120
No
Badge usage

Could the current firewall be retrieved from a BadgeInterface implementation?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/tree/5.1/src/Symfony/Component/Security/Http/Authenticator/Passport/Badge

No

Enumeration - Transformation

Is the following code valid?

<?php
enum Suit: string
{
    case Hearts = 'H';
    case Diamonds = 'D';
    case Clubs = 'C';
    case Spades = 'S';
}
$h = Suit::tryFrom('E');

https://www.php.net/manual/en/backedenum.tryfrom.php

Container configuration

Could the build hash of the container be configured?
Correct
- No
The choices were
- Yes
- No
Help
- https://symfony.com/doc/3.4/reference/configuration/kernel.html#container-build-time
- The container.build_hash parameter is exposed but cannot be configured, the hash is obtained thanks to ContainerBuilder::hash() during the compilation/dump phase of the container.
No

Route matching

Considering the following definition of route:

use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;
$collection = new RouteCollection();
$collection->add('_hello', new Route('/hello/{username}', array(
    '_controller' => 'App\Controller\DemoController:hello',
), array(
    'username' => '.+',
)));

Will the /hello/John/Doe URI match this route?

https://symfony.com/doc/4.4/routing.html#slash-characters-in-route-parameters

ContainerParameterBag usage

Could a parameter be removed from a Symfony\Component\DependencyInjection\ParameterBag\ContainerBag?
Correct
- No
The choices were
- Yes
- No
Help

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/DependencyInjection/ParameterBag/ContainerBag.php

No
Signature compatibility rules

Will the following code raise an error or a warning?
```
<?php
class A
{
    public function foo($arg1) {
        // ...
    }
}
class B extends A
{
    public function foo($arg1, $arg2) {
        // ...
    }
}
$b = new B();
```
Wrong
- No
The choices were
- Yes, the declaration of B::foo($arg1, $arg2) must be compatible with A::foo($arg1)
- Yes, class B cannot inherit from class A
- No
Help

https://www.php.net/manual/en/language.oop5.basic.php#language.oop.lsp

Routing

Given the following routing configuration:

// src/Controller/BlogController.php
namespace App\Controller;
use Symfony\Component\Routing\Annotation\Route;
class BlogController
{
    /**
     * @Route("/blog/articles", name="blog_articles")
     */
    public function listArticles(int $page)
    {
        // ...
    }
}

Does the path /blog/articles?page=1 can display the page without error ?

https://symfony.com/doc/2.7/routing.html

Constants vs Configuration Options

According to the official Symfony Best Practices Guide, is it recommended to store global settings that rarely change in raw PHP constants instead of storing them under a configuration dedicated file?
Wrong
- No
The choices were
- No
- Yes
Help

https://symfony.com/doc/current/best_practices.html#use-constants-to-define-options-that-rarely-change
class

With the following class definition what will be returned by \NamespaceName\Example\ClassName::class?
```
<?php
namespace NamespaceName\Example;
class ClassName
{
}
```
Correct
- NamespaceName\Example\ClassName
The choices were
- NamespaceName\Example\ClassName
- \NamespaceName\Example\ClassName
- NamespaceName\Example
- ClassName
Help
- https://php.net/manual/en/language.oop5.basic.php#language.oop5.basic.class.class
NamespaceName\Example\ClassName

PHP - Object assignment

What will be the output ?

<?php
class SimpleClass
{
}
$instance = new SimpleClass();
$assigned   =  $instance;
$reference  =& $instance;
$instance->var = '$assigned will have this value';
$instance = null; // $instance and $reference become null
var_dump($instance);
var_dump($reference);
var_dump($assigned);

NULL
NULL
object(SimpleClass)#1 (1) {
  ["var"]=>
  string(30) "$assigned will have this value"
}

An error

NULL
NULL
object(SimpleClass)#1 (1) {
  ["var"]=>
  string(30) "$assigned will have this value"
}

NULL NULL object(SimpleClass)#1 (1) { ["var"]=> string(30) "$assigned will have this value" }

printf

What is the output ?
```
$name = 'Jean Luc';
$age  = 9;
printf("My name is %2$.4s and I'm %1$02d", $age, $name);
```
Correct
- My name is Jean and I'm 09
The choices were
- My name is Jean 9 and I'm Luc
- My name is 9 and I'm Jean Luc
- My name is Jean and I'm 09
- My name is $Jean Luc and I'm $9
- My name is Jean Luc and I'm 9
Help

http://php.net/manual/en/function.printf.php

My name is Jean and I'm 09
Usage

Which type of Message can be used to MessageConverter::toEmail() in order to create an Email?
Correct
- Message
- RawMessage
The choices were
- RawMessage
- Message
- string
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/Mime/MessageConverter.php#L31

Message RawMessage
FrozenParameterBag usage

Which exception is thrown when clearing parameters from a FrozenParameterBag?
Correct
- LogicException
The choices were
- InvalidArgumentException
- RuntimeException
- LogicException
- BadMethodCallException
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php

LogicException
FrozenParameterBag usage

Which exception is thrown when removing a parameter from a FrozenParameterBag?
Correct
- LogicException
The choices were
- InvalidArgumentException
- BadMethodCallException
- RuntimeException
- LogicException
Help

https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/DependencyInjection/ParameterBag/FrozenParameterBag.php

LogicException
Translator configuration

What is the purpose of the logging: true option in the translator config?
```
framework:
    translator:
        logging: true
```
YAML
Correct
- Log a message when Symfony doesn't find a translation for the given locale.
The choices were
- Translate all log messages in the default locale.
- Log a message when Symfony translate a string in the given locale.
- Log a message when the given local is not configured.
- Log a message when Symfony doesn't find a translation for the given locale.
Help

https://symfony.com/doc/2.6/reference/configuration/framework.html#logging

Log a message when Symfony doesn't find a translation for the given locale.
Twig loaders definition

What are Twig loaders responsible for?
Correct
- Loaders are responsible for loading templates from a resource name.
The choices were
- Loaders are responsible for loading token parsers.
- Loaders are responsible for loading extensions.
- Loaders are responsible for loading environments such as Twig_Evironment.
- Loaders are responsible for loading templates from a resource name.
Help

https://twig.symfony.com/doc/2.x/api.html#loaders

Loaders are responsible for loading templates from a resource name.
Type Guesser Confidence

What are the "confidence" constants available in the Symfony\Component\Form\Guess\Guess class?
Correct
- LOW_CONFIDENCE
- HIGH_CONFIDENCE
- MEDIUM_CONFIDENCE
- VERY_HIGH_CONFIDENCE
The choices were
- UNKNOWN_CONFIDENCE
- HIGH
- VERY_VERY_LOW_CONFIDENCE
- UNKNOWN
- MEDIUM
- VERY_VERY_HIGH
- VERY_HIGH_CONFIDENCE
- VERY_VERY_HIGH_CONFIDENCE
- LOW
- VERY_LOW_CONFIDENCE
- LOW_CONFIDENCE
- MEDIUM_CONFIDENCE
- VERY_LOW
- HIGH_CONFIDENCE
- VERY_VERY_LOW
- VERY_HIGH
Help
- https://symfony.com/doc/2.7/form/type_guesser.html
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Form/Guess/Guess.php
LOW_CONFIDENCE HIGH_CONFIDENCE MEDIUM_CONFIDENCE VERY_HIGH_CONFIDENCE
Standard

The Symfony validator is based on…?
Correct
- JSR 303
The choices were
- RFC 2616
- PSR-2
- JSR 303
- CVE-2015-2308
Help

http://symfony.com/doc/current/book/validation.html

JSR 303
Array and loops

Which interface(s) should an Object implement to be usable in a foreach statement?
Wrong
- IteratorAggregate
- ArrayAccess
The choices were
- IteratorAggregate
- ArrayAccess
- Traversable
Help

https://www.php.net/manual/en/reserved.interfaces.php
Array behaviour

Which interface should an object implement to use brackets notation as an array?
Wrong
- IteratorAggregate
The choices were
- Iterator
- Traversable
- IteratorAggregate
- ArrayAccess
Help

https://www.php.net/manual/en/class.arrayaccess.php

Generator in response

use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
class DefaultController
{
    #[Route('/', name: 'default')]
    public function default(Request $request)
    {
        return new JsonResponse([
            'data' => $this->getData(),
        ]);
    }
    private function getData(): \Generator
    {
        yield 'foo';
        yield 'bar';
        yield 'baz';
    }
}

It will return {"data":["foo","bar","baz"]}

It will throw an \InvalidArgumentException
It will return {"data":["foo","bar","baz"]}
It will return {"data":{}}

To make use of generators in a JsonReponse you'll have to use StreamedJsonResponse introduced in 6.3.
https://symfony.com/blog/new-in-symfony-6-3-dx-improvements-part-2#streamed-json-responses
https://phpsandbox.io/e/x/lq86x?layout=EditorPreview&defaultPath=%2F&theme=dark&showExplorer=no&openedFiles=

Console

Given the following console event subscriber:

<?php
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Console\ConsoleEvents;
class ConsoleListener implements EventSubscriberInterface
{
  private AppChecker $appChecker;
  public function __construct(AppChecker $appChecker)
  {
    $this->appChecker = $appChecker;
  }
  public static function getSubscribedEvents()
  {
    return [
        ConsoleEvents::TERMINATE => 'setCode'
    ];
  }
  public function setCode(ConsoleEvent $event): void
  {
    if (!$this->appChecker->isOk()) {
      $event->getCommand()->setCode(232);
    }
  }
}

What will be the result of setCode method call?

It will change the command exit status code to 232

It will change the command exit status code to 232
It will trigger an error

https://github.com/symfony/symfony/blob/2.2/src/Symfony/Component/Console/Command/Command.php#L248

HTTP Expiration Model

What can happen to an HTTP response whose Cache-Control header value equals private, max-age=120?
Correct
- It will be cached by the web browser.
The choices were
- It will only be cached by any shared proxy servers including reverse proxies.
- It prevents the response from being cached by the web browser or any shared proxies.
- It will be cached by the web browser.
- It will be cached by a reverse proxy cache like Varnish.
- It will be cached by any proxy server.
Help

https://tools.ietf.org/html/rfc2616#page-79

It will be cached by the web browser.
CardScheme Constraint

What does the CardScheme Constraint stand for ?
Correct
- It validates that a card number is valid for a given credit card company
The choices were
- It validates that a card number is valid for a given credit card company
- It doesn't exist
- It validates if a credit card is a VISA one
- It validates a credit card number
Help

https://symfony.com/doc/2.2/reference/constraints/CardScheme.html

It validates that a card number is valid for a given credit card company
Max-forwards usage

What should do an intermediary if the Max-Forwards header is equal to 0?
Correct
- It should not forward the request
The choices were
- It should not forward the request
- Nothing
- This header doesn't exist
- It should forward the request no matter the header value
Help

https://tools.ietf.org/html/rfc7231#section-5.1.2

It should not forward the request
The FrameworkBundle AbstractController Class

Which of the following statements is true about the AbstractController class located in the FrameworkBundle bundle?
Wrong
- It must always be the parent class for every single controller of the application.
The choices were
- It must always be the parent class for every single controller of the application.
- It declares a controller as a service.
- It provides helper methods.
- It can provide by default any services of the application.
Help
- https://github.com/symfony/symfony/blob/3.3/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
- https://symfony.com/doc/current/controller.html
Default command name

What is the default command of a Symfony/Component/Console/Application?

In other words, what is the default value of the Symfony\Component\Console\Application::$defaultCommand property?
Wrong
- It is mandatory to specify a default command name when creating a Symfony\Component\Console\Application.
The choices were
- help
- It is mandatory to specify a default command name when creating a Symfony\Component\Console\Application.
- version
- list
Help

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Console/Application.php#L96 https://symfony.com/doc/6.0/components/console/changing_default_command.html
CSRF Protection

With de the default configuration, how to enable CSRF protection on a form ?
Correct
- It is enabled by default.
The choices were
- By adding the csrf_token option to the form type.
- By adding the csrf_token option to the form view.
- It is enabled by default.
- By adding the csrf_protection option to the form type.
Help
- https://symfony.com/doc/current/reference/configuration/framework.html
It is enabled by default.
Options

Which of the following are true about Symfony\Component\OptionsResolver\Options?
Correct
- It is an interface.
- The OptionsResolver class implements Options.
The choices were
- It is an abstract class.
- The OptionsResolver class implements Options.
- It is an interface.
- The OptionsResolver class extends Options.
Help
- https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/OptionsResolver/Options.php
- https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/OptionsResolver/OptionsResolver.php
It is an interface. The OptionsResolver class implements Options.
Access Decision Manager

How does the AccessDecisionManager behave when configured with a consensus voting strategy?
Correct
- It grants access if there is at least a majority of all the voters granting access.
The choices were
- It grants access if over two-thirds of voters answer the access is granted.
- It grants access as soon as there is one voter granting access.
- It grants access if there is at least a majority of all the voters granting access.
- It only grants access if none of the voters deny access.
Help

https://symfony.com/doc/2.x/security/voters.html#changing-the-access-decision-strategy

It grants access if there is at least a majority of all the voters granting access.
Normalization

What is the purpose of Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition::fixXmlConfig ?
Correct
- It ensures that single XML elements are turned into an array
- It normalizes XML element name (e.g. pluralizing the key used in XML)
The choices were
- It applies a custom function to an XML element if an error occurs
- It normalizes XML element name (e.g. pluralizing the key used in XML)
- It ensures that single XML elements are turned into an array
- It always applies a custom function to an XML element
Help

http://symfony.com/doc/current/components/config/definition.html#normalization

It ensures that single XML elements are turned into an array It normalizes XML element name (e.g. pluralizing the key used in XML)
BirthdayType overriding.

What is the main difference between the Symfony\Component\Form\Extension\Core\Type\BirthdayType form type and its parent Symfony\Component\Form\Extension\Core\Type\DateType ?
Correct
- It defaults the years option to 120 years ago to the current year.
The choices were
- It defaults the years option to 120 years ago to the current year.
- It adds a little "bithday cake" icon right before the widget.
- Those form types does not inherit from each other.
- This is only semantical, there is no real difference between them.
Help

http://symfony.com/doc/current/reference/forms/types/birthday.html

It defaults the years option to 120 years ago to the current year.
Inheritance type check

Which of the following assertions are true about the instanceof keyword?
Wrong
- It checks if a variable value is an instance of a dedicated class.
- It checks if a variable value is an instance of a class that implements a certain interface.
The choices were
- It checks if a variable value is an instance of a class that implements a certain interface.
- It checks if a variable value is an iterable data structure.
- It checks if a variable value is of type object.
- It checks if a variable value is an instance of a dedicated class.
Help
- http://www.php.net/instanceof
Console

Which sentence is true about the ConsoleLogger shipped in the console component ?
Correct
- It allows to display log messages to stdout
The choices were
- It allows to display log messages to stdout
- It allows to log messages (formatted in a simpler format than Monolog default log format) into a file without having to install Monolog
- It allows to log messages (formatted with Monolog default log format) into a file without having to install Monolog
Help
- https://symfony.com/doc/2.5/components/console/logger.html
It allows to display log messages to stdout
Autowiring

What is the purpose of the autowire configuration flag in a service definition?
Correct
- It allows implicit dependencies registration based on the service constructor's typehint.
The choices were
- It allows the service to be automatically called on some kernel events.
- It allows to get ride of the a circular reference error for the service.
- It allows implicit dependencies registration based on the service constructor's typehint.
Help

https://symfony.com/doc/current/components/dependency_injection/autowiring.html

It allows implicit dependencies registration based on the service constructor's typehint.
Constraint

Which of the following are Symfony built-in validation constraint?
Correct
- IsNull
- Blank
- NotNull
- NotBlank
The choices were
- Null
- IsNull
- NotNull
- Blank
- IsBlank
- NotBlank
Help
- http://symfony.com/doc/current/reference/constraints.html
IsNull Blank NotNull NotBlank
Request usage

Which exception is thrown if Request::getClientIps() detect that ips are not consistent?
Wrong
- InvalidArgumentException
The choices were
- LogicException
- InconsistentIpsException
- ConflictingHeadersException
- InvalidArgumentException
- RuntimeException
Help

https://github.com/symfony/symfony/blob/2.7/src/Symfony/Component/HttpFoundation/Request.php#L798
Wrap operation

What is the purpose of the wrap method of the AbstractString class?
Correct
- Instantiate multiple objects of the String component in one call by passing an array of strings as an argument
The choices were
- Instantiate multiple objects of the String component in one call by passing an array of strings as an argument
- To concatenate multiple strings in one, like the \implode(...) native method
- To compress strings passed as arguments to minimize memory consumption when dealing with gigantic strings
Help

https://github.com/symfony/symfony/blob/5.0/src/Symfony/Component/String/AbstractString.php

Instantiate multiple objects of the String component in one call by passing an array of strings as an argument
Storing Web Assets

According to the official Symfony Best Practices Guide, where do you have to store your assets?
Correct
- Inside the assets/ directory.
The choices were
- Inside the public/ directory.
- Inside the assets/ directory.
- Inside the src/Resources/public/ directory.
Help
- https://symfony.com/doc/current/best_practices.html#web-assets
- https://symfony.com/doc/6.0/frontend/encore/simple-example.html
Inside the assets/ directory.
Options variants.

Which of the following are not built-in option variants ?
Wrong
- InputOption::VALUE_OPTIONAL
- InputOption::VALUE_NONE
- InputOption::VALUE_REQUIRED
- InputOption::VALUE_IS_ARRAY
The choices were
- InputOption::VALUE_NOT_REQUIRED
- InputOption::VALUE_IS_ARRAY
- InputOption::VALUE_NONE
- InputOption::VALUE_REQUIRED
- InputOption::VALUE_OPTIONAL
- InputOption::VALUE_IS_MULTIPLE
Help
- http://symfony.com/doc/current/console/input.html#using-command-options

Dynamic routes

Given the following route attribute, to display a blog post:

#[Route('/blog/{post<[0-9]+>}', name:'view_blog_post')]

how to retrieve the post id ?

Injecting $post into the controller action:

public function viewBlogPost(int $post): Response
{
    //...
}

$post will contain the post id

public function viewBlogPost(Request $request): Response
{
    $postId = $request->attributes->get('post');
    //...
}

public function viewBlogPost(Request $request): Response
{
    $postId = $request->attributes->post;
    //...
}

public function viewBlogPost(Request $request): Response
{
    $postId = $request->attributes->post;
    //...
}

public function viewBlogPost(Request $request): Response
{
    $postId = $request->route->get("post");
    //...
}

public function viewBlogPost(Request $request): Response
{
    $postId = $request->route->post;
    //...
}

Injecting $post into the controller action:

public function viewBlogPost(int $post): Response
{
    //...
}

$post will contain the post id

public function viewBlogPost(Request $request): Response
{
    $postId = $request->attributes->get('post');
    //...
}

LocaleListener

What is the aim of the Symfony\Component\HttpKernel\EventListener\LocaleListener::onKernelRequest() listener on kernel.request event?
Correct
- Initializes the locale based on the current request.
The choices were
- Find the user locale based on the user session.
- Initializes the locale based on the current request.
- Save the current locale in a cookie
Help
- https://github.com/symfony/symfony/blob/3f43534332046a141a179184eb58620b7e3d9ed3/src/Symfony/Component/HttpKernel/EventListener/LocaleListener.php#L56
Initializes the locale based on the current request.
RouterListener

What is the aim of the Symfony\Component\HttpKernel\EventListener\RouterListener::onKernelRequest() listener on kernel.request event?
Correct
- Initializes the context from the request and sets request attributes based on a matching route.
The choices were
- Initializes the context from the request and sets request attributes based on a matching route.
- Find the correct URL to generate for a route to create a redirect response.
- Checks if the user is allowed to use the current route.
Help
- https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/HttpKernel/EventListener/RouterListener.php#L91
Initializes the context from the request and sets request attributes based on a matching route.
Status Codes

What do 1xx codes stand for ?
Correct
- Informational
The choices were
- Client Error
- They don't exist.
- Server Error
- Informational
Help

https://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html#sec6.1.1

Informational
Form buttons

Given the context where a form needs to contain multiple buttons, where shouldn't the buttons be defined?
Correct
- In the template
The choices were
- In the controller
- In the template
- In the form type
Help

https://symfony.com/doc/2.x/form/multiple_buttons.html

In the template
Application-Related Configuration

According to the official Symfony Best Practices Guide, where should the application specific configuration parameters be stored?
Correct
- In the config/services.yaml file.
The choices were
- In the .app.yml file at the root of the project directory.
- In the config/parameters.yaml file.
- In the src/Kernel.php file.
- In global environment variables.
- In the config/services.yaml file.
Help

http://symfony.com/doc/4.0/best_practices/configuration.html#application-related-configuration

In the config/services.yaml file.
Storing Informations

Where should sensitive informations (like API tokens) be stored ?
Correct
- In an .env file like .env.local.
The choices were
- In config/parameters.yaml.
- In config/services.yaml.
- In an .env file like .env.local.
Help
- https://symfony.com/doc/current/configuration/secrets.html
In an .env file like .env.local.
Form inheritance.

What should you do in order to use the form inheritance mechanism ?
Correct
- Implement the getParent method of the Symfony\Component\Form\FormTypeInterface.
The choices were
- Declare your form as a service and define the parent property on it.
- Implement the getParent method of the Symfony\Component\Form\FormTypeInterface.
- Set the inherit_data option to true.
- Use the PHP built-in class inheritance.
Help

http://symfony.com/doc/current/form/create_custom_field_type.html

Implement the getParent method of the Symfony\Component\Form\FormTypeInterface.
ETag validation

Which Request header is used to check the ETag validity ?
Correct
- If-None-Match
The choices were
- If-None-Match
- Last-Modified
- Etag
- Cache-Control
Help

http://symfony.com/doc/current/http_cache/validation.html#validation-with-the-etag-header

If-None-Match
Types

Among the following, which one is not a built-in form type?
Correct
- IbanType
The choices were
- PasswordType
- MoneyType
- IbanType
- NumberType
Help

http://symfony.com/doc/current/reference/forms/types.html

IbanType
Is user logged in

Which role allows you to check that a user is logged in (whatever the means, ex: remember_me cookie, login form, etc)?
Correct
- IS_AUTHENTICATED
- IS_AUTHENTICATED_FULLY
- IS_AUTHENTICATED_REMEMBERED
The choices were
- IS_AUTHENTICATED
- IS_FULLY_AUTHENTICATED
- IS_AUTHENTICATED_ANONYMOUSLY
- IS_AUTHENTICATED_REMEMBERED
- IS_AUTHENTICATED_FULLY
Help
- https://github.com/symfony/symfony/blob/b101b71ddacfa664485bb09ec6272971e458f49f/src/Symfony/Component/Security/Core/Authorization/Voter/AuthenticatedVoter.php#L75
- https://github.com/symfony/symfony/blob/b101b71ddacfa664485bb09ec6272971e458f49f/src/Symfony/Component/Security/Core/Authentication/AuthenticationTrustResolver.php#L26
IS_AUTHENTICATED IS_AUTHENTICATED_FULLY IS_AUTHENTICATED_REMEMBERED
Exception

Which exception is thrown when a directory creation has failed ?
Correct
- IOException
The choices were
- DirectoryException
- FileException
- FileSystemException
- IOException
- InvalidFileException
Help

https://symfony.com/doc/2.7/components/filesystem.html#error-handling

IOException
Loading type

Which type of loader is not supported by Symfony?
Correct
- INI
The choices were
- YML
- Closure
- INI
- PHP
Help

https://github.com/symfony/symfony/tree/3.0/src/Symfony/Component/Routing/Loader

INI
Autoload

What will be the output of the following code?
```
spl_autoload_register(function ($a) {
    echo 'I am at the top of the auto-loaders stack';
}, true, true);
if (class_exists('\Exception', true)) {
    echo 'Loaded';
}
```
Wrong
- I am at the top of the auto-loaders stackLoaded
The choices were
- PHP Fatal error: Uncaught Error: Class 'Exception' not found
- Nothing
- I am at the top of the auto-loaders stackLoaded
- I am at the top of the auto-loaders stack
- Loaded
Help
Form Extension

Which of these extensions are a built-in ones ?
Wrong
- HttpFoundationRequestHandler
- HttpFoundationExtension
The choices were
- DataCollectorExtension
- HttpFoundationExtension
- HttpFoundationRequestHandler
- DependencyInjectionExtension
Help
- https://github.com/symfony/symfony/tree/2.3/src/Symfony/Component/Form/Extension
- HttpFoundationRequestHandler is an implementation of RequestHandlerInterface and not an extension.
Form Extension

Which of these extensions are a built-in ones ?
Wrong
- HttpFoundationExtension
- DependencyInjectionExtension
The choices were
- DependencyInjectionExtension
- HttpFoundationExtension
- HttpFoundationRequestHandler
- DataCollectorExtension
Help
- https://github.com/symfony/symfony/tree/2.3/src/Symfony/Component/Form/Extension
- HttpFoundationRequestHandler is an implementation of RequestHandlerInterface and not an extension.
Null coalesce operator

If the user variable is not defined, what will be the result of rendering this Twig template?
```
Hi {{ user.name ?? 'anonymous' }}!
```
Twig
Correct
- Hi anonymous!
The choices were
- Hi null!
- Hi anonymous!
- This template will display an error when rendering it.
- Hi!
- Hi ??!
Help
- The ?? operator is called "null coalesce operator" (as in PHP) and it was introduced in Twig 1.24 (January 2016)
- http://twig.symfony.com/doc/templates.html#other-operators
Hi anonymous!
FragmentListener

What is the aim of the Symfony\Component\HttpKernel\EventListener\FragmentListener::onKernelRequest() listener on kernel.request event?
Correct
- Handle as content fragments by this listener all URL paths starting with /_fragment.
The choices were
- Handle as content fragments by this listener all URL paths starting with /_fragment.
- Handle as content all files to let user download them.
- Handle as content all image, css, javascript that not require security.
- Handle as content all image, css, javascript that require security.
Help
- https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/HttpKernel/EventListener/FragmentListener.php
Handle as content fragments by this listener all URL paths starting with /_fragment.
PSR-7

What is PSR-7 about?
Correct
- HTTP
The choices were
- Autoloading
- Logger
- Caching
- HTTP
Help

http://www.php-fig.org/psr/

HTTP
OOP Basics

What does FQCN stand for ?
Correct
- Fully Qualified Class Name
The choices were
- Fake Query Content Normalizer
- Fully Qualified Class Name
- Full Query Class Normalize
Help
- https://www.php.net/manual/en/language.namespaces.rules.php
Fully Qualified Class Name
Events

If you need to modify the data given during pre-population or modify a form depending on the pre-populated data (adding or removing fields dynamically), to which event your code should be hooked?
Correct
- FormEvents::PRE_SET_DATA
The choices were
- FormEvents::POST_SET_DATA
- FormEvents::SUBMIT
- FormEvents::POST_SUBMIT
- FormEvents::PRE_SET_DATA
- FormEvents::PRE_SUBMIT
Help
- http://symfony.com/doc/current/components/form/form_events.html
FormEvents::PRE_SET_DATA
HiddenType errors display

What mechanism determines whether the errors belonging to a Symfony\Component\Form\Extension\Core\Type\HiddenType form type will be displayed ?
Wrong
- Form type inheritance.
The choices were
- Hidden fields listener.
- Form type inheritance.
- It is not possible to change the behavior of whether HiddenType errors are displayed.
- Error bubbling.
Help

https://symfony.com/doc/current/reference/forms/types/hidden.html

Instanceof Operator

What would be the output of this code ?

class Foo extends Bar implements Baz
{
}
$foo = new Foo();
if ($foo instanceof Foo) { echo 'Foo '; }
if ($foo instanceof Bar) { echo 'Bar '; }
if ($foo instanceof Baz) { echo 'Baz '; }

Foo Bar Baz

Foo Bar Baz
Bar
Foo
Foo Bar

https://www.php.net/manual/en/language.operators.type.php

Foo Bar Baz

Validator

Given the following object to validate configuration (and assuming no group is specified when validate is called):

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\GroupSequenceProviderInterface;
/**
 * @Assert\GroupSequenceProvider
 */
class Product implements GroupSequenceProviderInterface
{
  /**
   * @Assert\NotBlank(groups={"foo"})
   */
  private $foo;
  /**
   * @Assert\NotBlank(groups={"foo"})
   */
  private $foo2;
  /**
   * @Assert\NotBlank(groups={"Product"})
   */
  private $bar;
  /**
   * @Assert\NotBlank()
   */
  private $bar2;
  public function getGroupSequence(): array
  {
    return [['foo', 'Product']];
  }
}

First, $foo, $foo2 will be validated, then, $bar will be validated, and finally $bar2

$foo, $foo2, $bar, $bar2 will be validated in the same time
$foo, $foo2, $bar will be validated in the same time
First, $foo, $foo2 will be validated, then, $bar will be validated, and finally $bar2
First, $foo, $foo2 will be validated and then, $bar
First, $foo, $foo2 will be validated and then, $bar, $bar2

https://symfony.com/doc/3.4/validation/sequence_provider.html

Events usage

Which class can be used as argument when listening to kernel.controller_arguments?
Wrong
- FilterControllerArgumentsEvent
The choices were
- None, this event does not exist
- FilterControllerEvent
- ControllerEvent
- ControllerArgumentsEvent
- FilterControllerArgumentsEvent
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/HttpKernel/Event/ControllerArgumentsEvent.php
Twig loaders

Which of the following classes are Twig loaders available by default?
Correct
- FilesystemLoader
- ArrayLoader
- ChainLoader
The choices were
- FilesystemLoader
- DoctrineLoader
- ArrayLoader
- CacheLoader
- ChainLoader
Help

https://github.com/twigphp/Twig/tree/2.x/src/Loader

FilesystemLoader ArrayLoader ChainLoader
Code interpretation

Assuming that the validate() method detects no violations, what will the Response object contain?
```
// Controller/BookController.php
public function indexAction()
{
    $book = new Book();
    $validator = $this->get('validator');
    $errors = $validator->validate($book);
    return new Response((string) $errors);
}
```
Wrong
- Fatal error: Object of class ConstraintViolationList could not be converted to string.
The choices were
- Fatal error: Object of class ConstraintViolationList could not be converted to string.
- Notice: Array to string conversion.
- An empty string
- False
Help
- https://symfony.com/doc/2.7/validation.html#using-the-validator-service
- https://github.com/symfony/symfony/blob/2.0/src/Symfony/Component/Validator/ConstraintViolationList.php
Best Practices

According to the Symfony Best practices, is "smoke testing" considered a bad practice ?
Correct
- False
The choices were
- True
- False
Help
- https://symfony.com/doc/5.0/best_practices.html
False
Authorization

Authorization is the process that makes sure that a user is who he claims to be?
Correct
- False
The choices were
- True
- False
Help

http://symfony.com/doc/current/components/security/authorization.html

False
Process

Given $process is a Process object that runs a command asynchronously; calling $process->stop(3) will immediately send a SIGKILL signal to the running command.
Correct
- False
The choices were
- False
- True
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Process/Process.php#L636
False
`Expires` header usage

True or false: The Expires header's value must contain the number of seconds the response should be cached.
Correct
- False
The choices were
- True
- False
Help

https://symfony.com/doc/6.0/http_cache/expiration.html#expiration-with-the-expires-header

False
Assertions usage

What will be the result of that assertion?
```
$this->assertContainsOnly('string', ['1', '2', 3]);
```
Correct
- Failure
The choices were
- Failure
- Success
Help
- https://phpunit.de/manual/current/en/appendixes.assertions.html#appendixes.assertions.assertContainsOnly
Failure
assertSame

What will be the result of that assertion in a PHPUnit test?
```
self::assertSame('2204', 2204);
```
Correct
- Failure
The choices were
- Success
- Failure
Help
- https://phpunit.de/manual/current/en/appendixes.assertions.html#appendixes.assertions.assertSame
Failure
FormExtension usage

What is the prerequisite to create a FormTypeExtension
Wrong
- Extending the Symfony\Component\Form\AbstractTypeExtension
The choices were
- Creating a service with the form.type_extension tag
- Implementing the interface Symfony\Component\Form\FormTypeExtensionInterface
- Extending the Symfony\Component\Form\AbstractTypeExtension
- Putting the new MyFormExtension class in the Form\Extension namespace
Help
- https://symfony.com/doc/4.2/form/create_form_type_extension.html#defining-the-form-type-extension
- https://symfony.com/doc/4.2/form/create_form_type_extension.html#registering-your-form-type-extension-as-a-service
What are the four headers in http cache ?

What are the four primary headers in HTTP cache?
Correct
- Expires
- ETag
- Last-Modified
- Cache-Control
The choices were
- Expires-After
- Expires
- Cache-Control
- Last-Modified
- ETag
- Cached-Until
Help

https://www.rfc-editor.org/rfc/rfc9111.html

Expires ETag Last-Modified Cache-Control
Expiration Cache Model

Which of the following HTTP response headers belong to the expiration caching model?
Correct
- Expires
- Cache-Control
The choices were
- Etag
- Last-Modified
- Cache-Control
- Expires
- Pragma
Help

https://tools.ietf.org/html/rfc2616#page-79

Expires Cache-Control
HTTP Cache Models

Which of the following assertions is true about HTTP caching?
Wrong
- Expiration and validation are mutually exclusive and therefore cannot be used simultaneously.
The choices were
- Expiration and validation are mutually exclusive and therefore cannot be used simultaneously.
- Validation always wins over expiration.
- Expiration always wins over validation.
Help

http://symfony.com/doc/current/http_cache/validation.html
Exceptions

Consider the following code snippet:
```
try {
    call_this_undefined_function();
} catch (???? $e) {
    echo 'Oups, there is a serious problem there!';
}
```
Since PHP 7.0, which type/class could be used to replace the ???? placeholder in order to output Oups, there is a serious problem there! ?
Wrong
- Exception
The choices were
- Warning
- ErrorException
- Exception
- Error
- BadFunctionCallException
Help
- http://php.net/manual/en/language.exceptions.php
- http://php.net/manual/en/class.error.php
HTTP Cache Headers

Which HTTP response headers are involved in the validation caching model?
Correct
- Etag
- Last-Modified
The choices were
- Last-Modified
- Cache-Control: s-max-age
- Cache-Control: max-age
- Etag
Help

https://datatracker.ietf.org/doc/html/rfc7234#section-4.3

Etag Last-Modified
Variadic functions

What will be the result of this code?
```
<?php
function foo(...$params, $arg)
{
    echo "$arg";
}
foo(1,2,3,4);
```
Correct
- Error: Only the last parameter can be variadic
The choices were
- 1
- 2
- Error: Only the last parameter can be variadic
- Error : Variadic functions should have only one argument.
Help

https://www.php.net/manual/en/migration56.new-features.php#migration56.new-features.variadics

Error: Only the last parameter can be variadic
Twig template

Which method is used to render the desired template?
Correct
- Environment::render()
The choices were
- Environment::showTemplate()
- Environment::resolveTemplate()
- Environment::render()
- Environment::display()
Help
- https://twig.symfony.com/doc/1.x/api.html#rendering-templates
- https://github.com/twigphp/Twig/blob/1.x/src/Environment.php#L370
Environment::render()
Using a Persistence Layer

According to the Symfony Best Practices Guide and the Symfony's coding conventions, which directory of your application is meant to store your Doctrine entity classes?
Correct
- Entity
The choices were
- Mapping
- ActiveRecord
- Entity
- Model
- Doctrine
Help

https://symfony.com/doc/current/best_practices.html#use-the-default-directory-structure

Entity
HttpKernel

Which sentence about page fragments caching methods is true ?
Correct
- Edge Side Includes are partially implemented by Symfony
The choices were
- Server Side Includes are more performant than Edge Side Includes and are recommanded by Symfony
- Server Side Includes don't exist
- Server Side Includes are not implemented by Symfony
- Edge Side Includes are partially implemented by Symfony
Help

ESI are partially implemented ("The ESI specification describes tags you can embed in your pages to communicate with the gateway cache. Only one tag is implemented in Symfony[...]")
- https://symfony.com/doc/4.3/http_cache/esi.html
- https://symfony.com/doc/4.3/http_cache/ssi.html
Edge Side Includes are partially implemented by Symfony
Filesystem behaviour

Is the Filesystem component based on a lazy or eager implementation?
Wrong
- Eager
The choices were
- Eager
- Lazy
Help

https://github.com/symfony/symfony/blob/3.4/src/Symfony/Component/Filesystem/Filesystem.php
Validation model

Which HTTP headers can be used with the validation model?
Correct
- ETag
- Last-Modified
The choices were
- ETag
- Cache-Control
- Expires
- Last-Modified
Help

https://symfony.com/doc/6.0/http_cache/validation.html

ETag Last-Modified
Command

What kind of help provides the bin/console config:dump-reference command?
Correct
- Dumps the default configuration of a bundle.
The choices were
- Dumps the current configuration of a bundle.
- Dumps the current configuration in .htaccess format using the php_value directive.
- Adds the default configuration of a bundle in the app/config/config.yml file.
- Dumps the default configuration of a bundle.
Help

https://symfony.com/doc/current/configuration.html#configuration-reference-dumping

Dumps the default configuration of a bundle.
Symfony and Databases

What is the default ORM that integrates with Symfony ?
Correct
- Doctrine.
The choices were
- Hibernate.
- Doctrine.
- Propel.
- Symfony ORM.
Help
- https://symfony.com/doc/current/doctrine.html
Doctrine.
Debug command

What does the command debug:container router?
Wrong
- Displays the configured routes
The choices were
- Displays information for the service router
- Displays the configured routes
Help
- http://symfony.com/doc/current/book/service_container.html#debugging-services
Component arhitecture

What is the aim of the HandleTrait?
Wrong
- Dispatch sync message via a BusList and return a MessageList
The choices were
- Dispatch async messages and return the messages as a MessageList
- Dispatch sync message via a BusList and return a MessageList
- Dispatch sync messages via a bus and return its result.
Help

https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Messenger/HandleTrait.php
Connecting Listeners - Priority

What's true about the addListener()'s $priority value from Symfony\Component\EventDispatcher\EventDIspatcherInterface?
Correct
- Defaults to 0
- The higher this value, the earlier an event listener will be triggered in the chain
The choices were
- The higher this value, the later an event listener will be triggered in the chain
- Defaults to 1
- The higher this value, the earlier an event listener will be triggered in the chain
- Defaults to 100
- Defaults to 0
Help
- http://symfony.com/doc/current/components/event_dispatcher.html#connecting-listeners
Defaults to 0 The higher this value, the earlier an event listener will be triggered in the chain
Date format

Which formats of date are accepted in Email->date()?
Correct
- DatetimeImmutable
- Datetime
The choices were
- string
- DatetimeImmutable
- Datetime
Help

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Mime/Email.php#L65

DatetimeImmutable Datetime
Idempotent HTTP verbs.

Which HTTP verbs are idempotent ?
Correct
- DELETE
- PUT
- HEAD
- GET
- OPTIONS
The choices were
- POST
- CONNECT
- PATCH
- DELETE
- PUT
- OPTIONS
- HEAD
- GET
Help
- https://tools.ietf.org/html/rfc7231#section-4.2.2
- https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Idempotent_methods_and_web_applications
DELETE PUT HEAD GET OPTIONS
HTTP

Which encryption means is used to secure credentials when authenticating an HTTP request with the HTTP Basic mechanism?
Correct
- Credentials are not encrypted but only Base64 encoded.
The choices were
- Hashing (md5, sha1, etc.)
- Credentials are not encrypted but only Base64 encoded.
- Asymmetric-key encryption
- Symmetric-key encryption
- Credentials are not encrypted and transmitted in plain text in the HTTP request.
Help
- https://tools.ietf.org/html/rfc7235
- https://en.wikipedia.org/wiki/Basic_access_authentication
Credentials are not encrypted but only Base64 encoded.
FrameworkBundle

From Symfony 5, what is provided by the ControllerTrait ?
Correct
- ControllerTrait doesn't exist anymore
The choices were
- ControllerTrait doesn't exist anymore
- some helpers to render views
- shortcuts to return specific responses (json responses, redirect responses...)
- a service locator
Help
- https://github.com/symfony/framework-bundle/tree/5.0/Controller
ControllerTrait doesn't exist anymore
Injection Types

What are the recommended types of injections when injecting a service dependency into another?
Wrong
- Constructor injection
- Immutable-setter Injection
The choices were
- Setter injection
- Constructor injection
- Getter injection
- Property injection
- Immutable-setter Injection
Help
- https://symfony.com/doc/7.0/service_container/injection_types.html
- Immutable-setter Injection was introduced in 4.3
- using property injection is not recommanded
ValidateRequestListener exception

Which exception is thrown if ValidateRequestListener::onKernelRequest() detect that ips are not consistent?
Correct
- ConflictingHeadersException
The choices were
- InvalidArgumentException
- LogicException
- ConflictingHeadersException
- RuntimeException
- InconsistentIpsException
Help
- https://github.com/symfony/symfony/blob/2.7/src/Symfony/Component/HttpKernel/EventListener/ValidateRequestListener.php
- https://github.com/symfony/symfony/blob/7d89a657f13e73069ba40f1d0793c1652b01dfc2/src/Symfony/Component/HttpFoundation/Request.php#L1974
ConflictingHeadersException
ChoiceType rendering

If the expanded and multiple options are set to true on a Symfony\Component\Form\Extension\Core\Type\ChoiceType form type, what is displayed when rendering the form ?
Correct
- Checkboxes.
The choices were
- Checkboxes.
- Radio buttons.
- Select tag.
- Select tag (with multiple attribute).
Help

http://symfony.com/doc/current/reference/forms/types/choice.html

Checkboxes.
Security User Providers

What UserProvider allows to fetch users from multiple sources ?
Correct
- ChainUserProvider
The choices were
- CompositeUserProvider
- ChainUserProvider
- MultipleUserProvider
- AggregateUserProvider
Help
- https://symfony.com/doc/5.x/security/user_providers.html
ChainUserProvider
HTTP

Which HTTP response header instructs a cache to send a request to the origin server for validation before releasing a cached copy ?
Correct
- Cache-control: must-revalidate
- Cache-control: no-cache
The choices were
- Cache-control: no-store
- Cache-control: must-revalidate
- Cache-control: no-cache
- Cache-control: private
Help
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching#Controlling_caching
Cache-control: must-revalidate Cache-control: no-cache
Cache

Which of these HTTP headers tell a reverse proxy cache like Varnish to cache the response it receives during 90 minutes?
Correct
- Cache-Control: public, s-maxage=5400
The choices were
- Cache-Control: public, s-maxage=5400
- Cache-Control: public, s-maxage=90
- Cache-Control: public
- Cache-Control: private, maxage=5400
- Cache-Control: private, maxage=90
Help
- https://tools.ietf.org/html/rfc2616
- https://tools.ietf.org/html/rfc7234#section-5.2
Cache-Control: public, s-maxage=5400
Path utilities

Given the following code, what will be displayed?
```
<?php
use Symfony\Component\Filesystem\Path;
echo Path::getRoot("C:\Programs\Apache\Config");
```
Correct
- C:/
The choices were
- C:/Programs
- C:/Programs/
- C:/Programs/Apache/Config
- C:/
- C:/Programs/Apache/
- C:/Programs/Apache
Help
- https://symfony.com/doc/5.4/components/filesystem.html#finding-directories-root-directories
- https://github.com/symfony/filesystem/blob/5.4/Path.php#L207
C:/
Binary content

When dealing with binary content, which class of the String component are you the most likely to use?
Correct
- ByteString
The choices were
- ByteString
- CodePointString
- UnicodeString
Help

https://symfony.com/doc/5.0/components/string.html

ByteString
Static arrow functions

We sometimes come across arrow functions declared as static, like in the code below:
```
class Foo
{
    public function bar(): iterable
    {
        $array = \range(1, 10);
        return array_map(static fn($x) => $x*$x, $array);
    }
}
```
Which of the following choices is true
Correct
- By using the static modifier, $this (representing the current instance of Foo) won't be bound and "injected" in the arrow function. It will result in a faster execution, as this binding doesn't have to be made
The choices were
- By using the static modifier, $this (representing the current instance of Foo) won't be bound and "injected" in the arrow function. It will result in a faster execution, as this binding doesn't have to be made
- It allows the arrow function to be able to access to $this, representing the current instance of Foo calling this method
- Nothing actually changes
Help

https://wiki.php.net/rfc/arrow_functions_v2

By using the static modifier, $this (representing the current instance of Foo) won't be bound and "injected" in the arrow function. It will result in a faster execution, as this binding doesn't have to be made
HTTP2

With cURL installed, how does the HTTP/2 support can be activated for http URLs?
Correct
- By using the 'http_version' => '2.0' configuration key when creating a new HttpClient
The choices were
- It's activated by default
- By using the 'http_version' => '2.0' configuration key when creating a new HttpClient
Help

https://symfony.com/doc/5.0/http_client.html#http-2-support

By using the 'http_version' => '2.0' configuration key when creating a new HttpClient
Config definition

How to overwrite a configuration array if the value is also defined in a second configuration array ?
Correct
- By using ->performNoDeepMerging()
The choices were
- By using ->canBeOverwritten()
- By using ->performNoDeepMerging()
- By using ->performDeepMerging()
- By using ->enableMerging()
Help

http://symfony.com/doc/current/components/config/definition.html#merging-options

By using ->performNoDeepMerging()
Console

How is it possible to generate absolute URLs from the Console?
Correct
- By running
```
$this->getContainer()->get('router')->getContext()->setHost('example.org');
```
- By overloading the parameter router.request_context.host in the configuration.
The choices were
- By overloading the parameter router.request_context.host in the configuration.
- The host is automatically known by Symfony, there is no need to specify it in CLI.
- By running
```
$this->getContainer()->get('router')->getContext()->setHost('example.org');
```
- By specifying the host parameter in the Twig function url().
Help

https://symfony.com/doc/4.x/routing.html#generating-urls-in-commands

By running $this->getContainer()->get('router')->getContext()->setHost('example.org'); By overloading the parameter router.request_context.host in the configuration.
Compiler Passes

How can you register a new compiler pass?
Correct
- By passing an instance of the CompilerPass to the addCompilerPass of a ContainerBuilder.
The choices were
- By passing an instance of the CompilerPass to the pushCompilerPass of a ContainerBuilder.
- By creating a new service with the tag compiler_pass.
- By passing an instance of the CompilerPass to the registerCompilerPass of a ContainerBuilder.
- By passing an instance of the CompilerPass to the addCompilerPass of a ContainerBuilder.
- By creating a new service with the tag compiler.pass.
Help

https://symfony.com/doc/current/service_container/compiler_passes.html

By passing an instance of the CompilerPass to the addCompilerPass of a ContainerBuilder.
OOP

How can you modify the copy of an object during a clone operation ?
Correct
- By implementing the __clone() method.
The choices were
- By implementing the __construct() method.
- By implementing the __clone() method.
- By creating your own method and putting the @clone annotation on it.
- By implementing the __get() and __set() methods.
- It is not possible.
Help

http://php.net/manual/en/language.oop5.cloning.php

By implementing the __clone() method.
Registering Functions

What are the possibles ways to register new functions in Symfony\Component\ExpressionLanguage\ExpressionLanguage?
Correct
- By calling the register() method.
- By calling the addFunction() method.
- By calling the registerProvider() method.
The choices were
- By calling the registerProvider() method.
- By calling the register() method.
- By calling the createFunction() method.
- By calling the addFunction() method.
- By calling the setFunctions() method.
Help
- https://symfony.com/doc/2.6/components/expression_language/extending.html
- https://github.com/symfony/symfony/blob/2.6/src/Symfony/Component/ExpressionLanguage/ExpressionLanguage.php
By calling the register() method. By calling the addFunction() method. By calling the registerProvider() method.
Host conditions

How to make a route matching only a specific host ?
Wrong
- By adding a hostkey in the requirements section of a route definition
The choices were
- By adding domain key in the route definition
- By adding a host key in the route definition
- it's not possible
- By adding a hostkey in the requirements section of a route definition
- By adding domain key in the requirements section of a route definition
Help

http://symfony.com/doc/current/routing/hostname_pattern.html
Command

When is the Symfony\Component\Console\Command::interact method executed?
Wrong
- Before Symfony\Component\Console\Command::execute method.
- After Symfony\Component\Console\Command::initialize method.
The choices were
- Before Symfony\Component\Console\Command::initialize method.
- Before Symfony\Component\Console\Command::execute method.
- After Symfony\Component\Console\Command::execute method.
- After the InputDefinition is validated.
- Before the InputDefinition is validated.
- After Symfony\Component\Console\Command::initialize method.
Help
- http://symfony.com/doc/current/console.html#command-lifecycle
- https://github.com/symfony/symfony/blob/3.0/src/Symfony/Component/Console/Command/Command.php

Trait

What will be the output of the following code?

<?php
class Base
{
   public function sayFoo()
   {
      echo 'Bar';
   }
}
trait SayFoo
{
    public function sayFoo()
    {
        parent::sayFoo();
        echo 'Foo';
    }
}
class Foo extends Base
{
    use SayFoo;
}
$foo = new Foo();
$foo->sayFoo();

BarFoo

BarFoo
Bar
FooBar
Foo

http://php.net/manual/en/language.oop5.traits.php

BarFoo

ImmutableEventDispatcher usage

Which exception is thrown when trying to remove a subscriber from an ImmutableEventDispatcher?
Correct
- BadMethodCallException
The choices were
- InvalidArgumentException
- FrozenEventDispatcherException
- BadMethodCallException
- RuntimeException
- LogicException
- InvalidArgumentException
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

BadMethodCallException
ImmutableEventDispatcher usage

Which exception is throw when trying to add a subscriber into an ImmutableEventDispatcher?
Correct
- BadMethodCallException
The choices were
- RuntimeException
- BadMethodCallException
- InvalidArgumentException
- FrozenEventDispatcherException
- LogicException
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

BadMethodCallException
ImmutableEventDispatcher usage

Which exception is throw when trying to add a listener into an ImmutableEventDispatcher?
Correct
- BadMethodCallException
The choices were
- LogicException
- RuntimeException
- Symfony\Component\DependencyInjection\Exeption\InvalidArgumentException
- InvalidArgumentException
- BadMethodCallException
- FrozenEventDispatcherException
Help

https://github.com/symfony/symfony/blob/2.1/src/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php

BadMethodCallException

Method overriding

Consider the following PHP code snippet:

<?php
class A
{
    protected $foo;
    private function foo()
    {
        $this->foo = 'A-foo';
    }
    public function bar()
    {
        $this->foo();
        return $this->foo;
    }
}
class B extends A
{
    private function foo()
    {
        $this->foo = 'B-foo';
    }
}
echo (new B())->bar();

What is the expected output when executing this script?

```
B-foo
```

PHP will raise a fatal error because it's not allowed to override a private method.
```
B-foo
```
```
A-foo
```
```
NULL
```

https://3v4l.org/InSq9

Utils

Which class can be used to extracts security errors from a Request?
Correct
- AuthenticationUtils
The choices were
- FrameworkUtils
- AuthenticationUtils
- HttpUtils
- RequestUtils
- SecurityUtils
Help
- https://github.com/symfony/symfony/blob/2.7/src/Symfony/Component/Security/Http/Authentication/AuthenticationUtils.php
AuthenticationUtils
Format

Which of the following formats are available to define validation rules or constraints?
Wrong
- Attributes
- YAML
- Annotations
- PHP
The choices were
- PHP
- JSON
- Attributes
- XML
- YAML
- Annotations
Help
- https://github.com/symfony/symfony/tree/master/src/Symfony/Component/Validator/Mapping/Loader
- http://symfony.com/doc/current/validation.html#constraint-configuration
Entities mapping

According to the official Symfony Best Practices Guide, which format do you need to use to define the mapping information of the Doctrine entities?
Correct
- Attributes
The choices were
- Annotations
- Yaml
- Xml
- PHP
- Attributes
Help

https://symfony.com/doc/5.3/best_practices.html#use-attributes-to-define-the-doctrine-entity-mapping

Attributes
Slugger

Which slugger is defined in the String Component?
Correct
- AsciiSlugger
The choices were
- Slugger
- AsciiSlugger
- UnicodeSlugger
- TraceableSlugger
Help

https://github.com/symfony/symfony/tree/6.2/src/Symfony/Component/String/Slugger

AsciiSlugger

References and foreach

What is the output of such a script ?

$a = [1, 2, 3];
foreach ($a as &$c) { }
foreach ($a as $c) { }
print_r($a);

Array
(
    [0] => 1
    [1] => 2
    [2] => 2
)

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

An error

Array
(
    [0] => 2
    [1] => 2
    [2] => 2
)

Array
(
    [0] => 1
    [1] => 2
    [2] => 2
)

Array
(
    [0] => 1
    [1] => 1
    [2] => 1
)

Array ( [0] => 1 [1] => 2 [2] => 2 )PHP

OOP

What type is the __debugInfo() magic method supposed to return?
Correct
- Array
The choices were
- Object
- Boolean
- Any type
- Array
- String
- Nothing
Help

http://php.net/manual/en/language.oop5.magic.php#object.debuginfo

Array
Apply usage

What's the aim of the apply tag?
Correct
- Apply one or multiple filters on a block
The choices were
- Apply one and only one filter on a block
- Define a new tag
- Apply a camelCase transformation to a text
- Apply one or multiple filters on a block
Help

https://twig.symfony.com/doc/1.x/tags/apply.html

Apply one or multiple filters on a block
Routing match

Given the following two routes, what controller will be executed for the URL /book/123?
```
 # config/routes.yaml
 book_detail_section:
     path:       /book/{id}/{section}
     controller: 'App\Controller\BookController::detailSection'
     defaults:   { section: home }
 book_detail:
     path:      /book/{id}
     controller: 'App\Controller\BookController::detail'
```
YAML
Wrong
- App\Controller\BookController::detail
The choices were
- App\Controller\BookController::detailSection
- App\Controller\BookController::detail
- Error: The routing file contains unsupported keys for “defaults”
- Error: No route found
Help
- https://symfony.com/doc/current/routing.html#priority-parameter
- https://symfony.com/doc/current/routing.html#extra-parameters

Route matching

Given the following routes, what controller will be executed for /book/123 ?

# config/routes.yaml
book_list:
    path:       /books
    controller: 'App\Controller\BookController::list'
book_detail:
    path:       /books/{slug}
    controller: 'App\Controller\BookController::detail'
book_download:
    path:       /books/{slug}/download
    controller: 'App\Controller\BookController::download'

App\Controller\BookController::detail

App\Controller\BookController::download
Error: No route found
App\Controller\BookController::detail
App\Controller\BookController::list

Routing match

If no methods are specified for a route, what methods will be matched?
Correct
- Any methods
The choices were
- Safe methods: GET or HEAD
- Any methods
- GET or POST
- GET
Help
- https://symfony.com/doc/4.3/routing.html#matching-http-methods
Any methods
Business Logic

According to the official Symfony Best Practices Guide, what format do you need to use to define/configure your own services?
Wrong
- Annotations
The choices were
- Annotations
- XML
- PHP
- YAML
Help

http://symfony.com/doc/current/best_practices/business-logic.html#service-format-yaml
Option

If I want to allow the client to specify CLI option --force, what am I going to add to the definition?
Correct
- An option InputOption.
The choices were
- A parameter InputParameter.
- An option InputOption.
- An argument InputArgument.
- A choice InputChoice.
Help
An option InputOption.
File

What is the kind of value of $file in the following code?
```
<?php
use Symfony\Component\Finder\Finder;
$finder = new Finder();
$finder->files()->in(__DIR__);
foreach ($finder as $file) {
    // ...
}
```
Correct
- An instance of Symfony\Component\Finder\SplFileInfo.
The choices were
- An instance of Symfony\Component\Finder\File.
- An instance of Symfony\Component\Finder\File\SplFileInfo.
- An instance of Symfony\Component\Finder\FileInfo.
- An instance of Symfony\Component\Finder\File\SplFile.
- An instance of Symfony\Component\Finder\SplFileInfo.
- An instance of Symfony\Component\Finder\File\File.
Help

https://symfony.com/doc/2.0/components/finder.html

An instance of Symfony\Component\Finder\SplFileInfo.
Process handling

Given a new process created in front of a Symfony command that return a 1 code, what will be returned by Process::mustRun()?
Wrong
- An instance of Process
The choices were
- 1
- An instance of Process
- true
- Nothing, a ProcessFailedException will be thrown
- false
Help

https://github.com/symfony/symfony/blob/2.5/src/Symfony/Component/Process/Process.php#L209
Empty_data usage

Which type of argument is passed if a closure is used in empty_data option?
Correct
- An instance of FormInterface
The choices were
- An array
- An instance of FormInterface
- Nothing
- An instance of Option
Help

https://symfony.com/doc/2.7/form/use_empty_data.html#option-2-provide-a-closure

An instance of FormInterface
Streams

What will be the output of the following piece of code ?
```
$google = fopen('http://www.google.com', 'r+');
echo fwrite($google, 'foo');
```
Correct
- An error saying Failed to open stream: HTTP wrapper does not support writeable connections.
The choices were
- 1
- An error saying Failed to open stream: HTTP wrapper does not support writeable connections.
- 3
- The results of the "foo" search on Google as plaintext.
- An error saying Failed to open stream: Permission denied.
- The results of the "foo" search on Google as HTML.
Help
- http://php.net/manual/en/book.stream.php
- http://php.net/manual/en/function.fopen.php
An error saying Failed to open stream: HTTP wrapper does not support writeable connections.
Anonymous Functions

What would be the output of this code ?
```
$myArray = [1, 2, 3];
$closure = function (int $a): int {
    return $myArray[$a];
};
echo $closure(1);
```
Correct
- An error is thrown
The choices were
- An error is thrown
- 2
- 1
Help
- https://www.php.net/manual/en/functions.anonymous.php
An error is thrown
Array functions

What is the output of the following PHP script?
```
<?php
$values = [37, 5, '09'];
$sorted = sort($values);
foreach ($sorted as $v) {
    echo $v;
}
```
Correct
- An error
The choices were
- 50937
- 09537
- An error
- 375509
Help
- https://php.net/array
- https://php.net/manual/en/function.sort.php
An error
Array functions

What is the output ?
```
<?php
array_combine([1, 2, 3, 6], [4,5,6]);
```
Correct
- An error
The choices were
- [1, 2, 3, 4, 5, 6]
- An error
- [1 => 4, 2 => 5, 3 => 6]
- [1 => 2, 3 => 4, 5 => 6]
Help
- https://php.net/array
- https://php.net/manual/en/function.array-combine.php
An error
Form Type

Which of the following can be represented as a Symfony\Component\Form\Extension\Core\Type\FormType?
Wrong
- An entire <form> with multiple fields to edit a user profile
- A group of several HTML fields used to input a postal address
The choices were
- An entire <form> with multiple fields to edit a user profile
- A group of several HTML fields used to input a postal address
- A single <input type="text"> form field
Help

https://symfony.com/doc/6.0/forms#form-types
`empty_data` and `data_class` options

What is the default value of the empty_data option when data_class is set?
Wrong
- An empty string
The choices were
- An empty string
- An empty array
- null
- A new instance of the class set in data_class
Help

https://symfony.com/doc/current/form/use_empty_data.html
`MimeTypes::getExtensions` return type

What will return Symfony\Component\Mime\MimeTypes::getExtensions(string $mimeType) when passing it an invalid MIME type?

Example: $mimeTypes->getExtensions('not/a-valid-type')
Correct
- An empty array
The choices were
- An Exception will be thrown.
- null
- An empty array
Help

https://github.com/symfony/symfony/blob/6.0/src/Symfony/Component/Mime/MimeTypes.php#L90

An empty array
The Serializer Context

What is a serializer context?
Correct
- An array passed on (de)serialization to control serializer features
The choices were
- An array passed on (de)serialization to control serializer features
- The global configuration of the serializer component
- The object to update during deserialization
- The initial data to serialize/deserialize
Help
- https://symfony.com/doc/5.x/serializer.html#serializer_serializer-context
An array passed on (de)serialization to control serializer features
Stamps

What is the constructor argument of ValidationStamp?
Correct
- An array of string or a GroupSequence
The choices were
- An instance of Constraint
- A formatted string using the following syntax foo, bar
- An array of string or a GroupSequence
Help

https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Messenger/Stamp/ValidationStamp.php

An array of string or a GroupSequence
Asserting exceptions

Which of the following are valid ways in PHPUnit to test the exceptions that occur when executing some PHP code?
Correct
- Add the following PHP call inside the test method:
```
$this->expectException('Fully\\Qualified\\ExceptionClassName');
```
The choices were
- You can't test PHP exceptions with PHPUnit.
- Wrap the entire test method in a try...catch but without processing the exception in any special way:
```
public function testSomething()
{
    try {
        // ...
    } catch(\Exception $e) {}
}
```
- Add the following PHP call inside the test method:
```
$this->expectException('Fully\\Qualified\\ExceptionClassName');
```
Help

https://phpunit.de/manual/current/en/writing-tests-for-phpunit.html#writing-tests-for-phpunit.exceptions

Add the following PHP call inside the test method: $this->expectException('Fully\\Qualified\\ExceptionClassName');PHP
Content negotiation headers

Which headers can trigger a 406 response status code if the server cannot produce a valid response?
Correct
- Accept-Language
- Accept
- Accept-Encoding
The choices were
- If-Range
- If-None-Match
- If-Match
- Accept-Encoding
- Accept
- Accept-Language
Help
- https://httpwg.org/specs/rfc7231.html#status.406
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406
Accept-Language Accept Accept-Encoding
Security informations

Which are the constants defined in Symfony\Component\Security\Core\Security class?
Correct
- AUTHENTICATION_ERROR
- ACCESS_DENIED_ERROR
- LAST_USERNAME
- MAX_USERNAME_LENGTH
The choices were
- LAST_USERNAME
- BAD_CREDENTIALS
- ACCESS_DENIED_ERROR
- AUTHENTICATION_ERROR
- MAX_USERNAME_LENGTH
- AUTHENTICATION_FAILURE
- WRONG_PASSWORD
Help

https://github.com/symfony/symfony/blob/2.7/src/Symfony/Component/Security/Core/Security.php

AUTHENTICATION_ERROR ACCESS_DENIED_ERROR LAST_USERNAME MAX_USERNAME_LENGTH
Array functions

Which of the following statements best describes the purpose of PHP's extract() function? This function accepts an array as its first argument.
Correct
- A variable is created in the current scope for each element in the given associative array.
The choices were
- The second argument is used to specify a data type (such as 'string'). All values in the passed array of that type are returned in a new array.
- Any ZIP files referenced in the passed array are extracted to the current working directory.
- The passed array is populated by any variables in the current scope.
- A variable is created in the current scope for each element in the given associative array.
Help
- https://www.php.net/array
- https://php.net/manual/en/function.extract.php
A variable is created in the current scope for each element in the given associative array.
Sub Requests

What is a sub request?
Correct
- A sub request serves to render just one small portion of a page instead of a full page.
The choices were
- A sub request is a request from a HTTP reverse proxy.
- A sub request serves to render just one small portion of a page instead of a full page.
- A sub request serves to create HTTP cache headers.
- A sub request is a request used in tests.
Help
- http://symfony.com/doc/current/components/http_kernel.html#sub-requests
A sub request serves to render just one small portion of a page instead of a full page.
Controller

What value type is returned by the Symfony\Bundle\FrameworkBundle\Controller\AbstractController::renderView() method?
Correct
- A string.
The choices were
- A string.
- An instance of Symfony\Component\HttpFoundation\Response.
- An instance of Symfony\Component\View\View.
- An instance of Symfony\Component\BrowserKit\Response.
Help
- https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php
- https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/Controller/AbstractController.php#L243
A string.
Connecting Listeners

What is the third argument of the addListener method of the Symfony\Component\EventDispatcher\EventDispatcher class?
Correct
- A priority integer that determines when a listener is triggered versus other listeners.
The choices were
- A PHP callable that will be executed when the specified event is dispatched
- An Event object.
- The event name (string) that this listener wants to listen to.
- A priority integer that determines when a listener is triggered versus other listeners.
Help
- http://symfony.com/doc/current/components/event_dispatcher/introduction.html#connecting-listeners
A priority integer that determines when a listener is triggered versus other listeners.
PHP and Databases

What is mysqlnd?
Correct
- A low level connector designed to replace libmysql dependency
The choices were
- A low level connector designed to replace libmysql dependency
- A persistent connection to a MySQL server
- A PHP extension adding some functions to interact with a MySQL server, like PDO
- A new RDBMS like MySQL or MariaDB
Help

http://www.php.net/mysqlnd

A low level connector designed to replace libmysql dependency
Dumpers

What is a Dumper?
Wrong
- A dumper is responsible for getting each property values of PHP object.
The choices were
- A dumper is responsible for getting each property values of PHP object.
- A dumper is responsible for creating a var_export of any PHP variable.
- A dumper is responsible for outputting a string representation of a PHP variable.
- A dumper is responsible for creating a var_dump of any PHP variable.
Help

https://symfony.com/doc/2.6/components/var_dumper/advanced.html#dumpers
Standards

What is PSR-12?
Correct
- A coding style guide.
The choices were
- A standard way to convert fully qualified names into file paths.
- A utility to convert non-namespaced PHP classes into namespaced ones.
- A coding style guide.
- A common logger interface.
Help

https://www.php-fig.org/psr/psr-12/

A coding style guide.
Standards

What are PSR-0 and PSR-4?
Wrong
- A coding style guide.
The choices were
- A specification for autoloading classes from file paths.
- A utility to convert non-namespaced PHP classes into namespaced ones.
- A coding style guide.
- A common logger interface.
Help
- http://www.php-fig.org/psr/psr-0/
- http://www.php-fig.org/psr/psr-4/
Standards

What is PSR-1?
Correct
- A basic coding standard.
The choices were
- A coding style guide.
- A basic coding standard.
- A standard way to convert fully qualified names into file paths.
- A common logger interface.
Help

http://www.php-fig.org/psr/psr-1/

A basic coding standard.
Cloners

What will be in $result with the following code?
```
<?php
use Symfony\Component\VarDumper\Cloner\VarCloner;
$myVar = /*...*/;
$cloner = new VarCloner();
$result = $cloner->cloneVar($myVar);
```
Correct
- A Symfony\Component\VarDumper\Cloner\Data object
The choices were
- An array.
- A Symfony\Component\VarDumper\Cloner\Clone object
- A Symfony\Component\VarDumper\Cloner\Data object
- An object of the same class of $myVar.
- A Symfony\Component\VarDumper\Cloner\CloneData object
- A Symfony\Component\VarDumper\Data object
Help
A Symfony\Component\VarDumper\Cloner\Data object
Reading from Arrays

What will be the result of the following code?
```
use Symfony\Component\PropertyAccess\PropertyAccess;
$accessor = PropertyAccess::createPropertyAccessor();
$person = array(
    'first_name' => 'Wouter',
);
$age = $accessor->getValue($person, '[age]');
```
Wrong
- A Symfony\Component\PropertyAccess\Exception\NoSuchPropertyException will be thrown.
The choices were
- A Symfony\Component\PropertyAccess\Exception\NoSuchIndexException will be thrown.
- The value of $age will be null.
- The value of $age will be 0.
- A Symfony\Component\PropertyAccess\Exception\NoSuchPropertyException will be thrown.
Help
- http://symfony.com/doc/current/components/property_access/introduction.html#reading-from-arrays
Reading from Arrays

What will be the result of the following code?
```
<?php
use Symfony\Component\PropertyAccess\PropertyAccess;
$accessor = PropertyAccess::createPropertyAccessor();
$person = array(
    'first_name' => 'Wouter',
);
$age = $accessor->getValue($person, 'age');
```
Wrong
- A Symfony\Component\PropertyAccess\Exception\NoSuchIndexException will be thrown.
The choices were
- The value of $age will be null.
- A Symfony\Component\PropertyAccess\Exception\NoSuchIndexException will be thrown.
- The value of $age will be 0.
- A Symfony\Component\PropertyAccess\Exception\NoSuchPropertyException will be thrown.
Help
Exception

With the following class:
```
<?php
use Symfony\Component\OptionsResolver\OptionsResolver;
class Mailer
{
    private $options;
    public function __construct(array $options = array())
    {
        $resolver = new OptionsResolver();
        $resolver->setDefaults(array(
            'host'     => 'smtp.example.org',
            'username' => 'user',
            'password' => 'pa$$word',
            'port'     => 25,
        ));
        $this->options = $resolver->resolve($options);
    }
}
```
what exception will be thrown while executing the code:
```
$mailer = new Mailer(array(
    'usernme' => 'johndoe',
));
```
Correct
- A Symfony\Component\OptionsResolver\Exception\UndefinedOptionsException.
The choices were
- A Symfony\Component\OptionsResolver\Exception\InvalidOptionsException.
- A Symfony\Component\OptionsResolver\Exception\NoSuchOptionException.
- A Symfony\Component\OptionsResolver\Exception\OptionDefinitionException.
- A Symfony\Component\OptionsResolver\Exception\MissingOptionsException.
- A Symfony\Component\OptionsResolver\Exception\UndefinedOptionsException.
Help
- https://symfony.com/doc/2.8/components/options_resolver.html#usage
A Symfony\Component\OptionsResolver\Exception\UndefinedOptionsException.
HTTP Request Handling

Consider the following code:
```
$result = $kernel->handle($request);
```
What does the $result variable contain at the end of this script?
Correct
- A Symfony\Component\HttpFoundation\Response instance.
The choices were
- An array.
- A Symfony\Component\HttpFoundation\Request instance.
- A Symfony\Component\HttpFoundation\Response instance.
- A string.
- A Symfony\Component\BrowserKit\Response instance.
- A Symfony\Component\BrowserKit\Request instance.
Help
- https://symfony.com/doc/current/components/http_kernel/introduction.html
A Symfony\Component\HttpFoundation\Response instance.
Output-disabled process

What happens if you try to get the output of process that has its output disabled?
Correct
- A LogicException is thrown
The choices were
- An InvalidArgumentException is thrown
- An empty string is returned
- A LogicException is thrown
- null is returned
Help

https://github.com/symfony/symfony/blob/6.2/src/Symfony/Component/Process/Process.php#L565-L578

A LogicException is thrown
Not yet started process's output

What happens if you try to get the output of process that has not been started yet?
Correct
- A LogicException is thrown
The choices were
- null is returned
- An InvalidArgumentException is thrown
- A LogicException is thrown
- An empty string is returned
Help

https://github.com/symfony/symfony/blob/6.2/src/Symfony/Component/Process/Process.php#L563-L577

A LogicException is thrown

Date Handling

What will be stored in $yaml with the following code:

<?php
use Symfony\Component\Yaml\Yaml;
$yaml = Yaml::parse('1983-07-01');

A DateTime object

DateTime {
  +"date": "1983-07-01 00:00:00.000000"
  +"timezone_type": 3
  +"timezone": "UTC"
}

An array
```
array:1 [
  0 => '1983-07-01'
]
```
```
425865600
```

An array

array:1 [
  0 => DateTime {
    +"date": "1983-07-01 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
]

```
1983-07-01
```
An array
```
array:1 [
  0 => 425865600
]
```

A DateTime object

DateTime {
  +"date": "1983-07-01 00:00:00.000000"
  +"timezone_type": 3
  +"timezone": "UTC"
}

http://symfony.com/doc/current/components/yaml.html#date-handling

Collection Length

Which constraint should be used to assert that a collection contains exactly 2 items?

We assume that Assert is an Alias to Symfony\Component\Validator\Constraints namespace.
Correct
- ```
@Assert\Count(min=2, max=2)
```
The choices were
- ```
@Assert\Length(2)
```
- ```
@Assert\Length(min=2, max=2)
```
- ```
@Assert\Count(min=2, max=2)
```
- ```
@Assert\Count(min=2)
```
Help

http://symfony.com/doc/current/reference/constraints/Count.html

@Assert\Count(min=2, max=2)
Function named arguments as an array

Is the following code correct?
```
class Foo
{
    public function qux(): void
    {
        $args = [
            'secondArgument' => 'arg',
            'firstArgument' => true,
        ];
        $this->bar(...$args);
    }
    private function bar(bool $firstArgument, string $secondArgument): void
    {
        // ...
    }
}
```
Wrong
- No
The choices were
- Yes
- No
Help
- https://www.php.net/manual/en/functions.arguments.php#functions.named-arguments
- https://3v4l.org/ts3aJ#v8.0.0
? class Foo { public function qux(): void { $args = [ 'secondArgument' => 'arg', 'firstArgument' => true, ]; $this->bar(...$args); } private function bar(bool $firstArgument, string $secondArgument): void { // ... } }PHP Wrong No
Configuration parameters in Route

Is the following route definition correct?
```
/**
 * @Route("/%kernel.environment%/page", name="page")
 */
public function action(): Response
{
    // ...
}
```
Correct
- Yes
The choices were
- No
- Yes
Help
- https://symfony.com/doc/2.7/routing/service_container_parameters.html
- https://symfony.com/doc/current/configuration.html#configuration-parameters
? /** * @Route("/%kernel.environment%/page", name="page") */ public function action(): Response { // ... }PHP Correct Yes
General knowledge

Which of the following assertions is correct?
Wrong
- PHP is a loosely-typed declarative language.
The choices were
- PHP is a strongly-typed imperative language.
- PHP is a strongly-typed, functionnal language.
- PHP is a loosely-typed imperative language.
- PHP is a loosely-typed functionnal language.
- PHP is a loosely-typed declarative language.
Help
- https://en.wikipedia.org/wiki/Programming_paradigm
? Wrong PHP is a loosely-typed declarative language.
Array functions

In the following code, what is the key of the element with value 25?
```
<?php
$myArray = [
    'foo' => 'bar',
    7 => 15,
    28
];
$myArray[] = 25;
```
Correct
- 9
The choices were
- 9
- 0
- 8
- 29
Help
- https://php.net/array
9
Array functions

What is the output of the following PHP script?
```
<?php
$numbers = array(5, 6, 7, 8);
end($numbers);
while (key($numbers)) {
    echo current($numbers);
    prev($numbers);
}
```
Correct
- 876
The choices were
- 5678
- 876
- 8765
- 321
Help
876
Terminal usage

What will be the value stored in $width when using the following code within a command and assuming that no environment variables are set and the stty command isn't available.
```
<?php
use Symfony\Component\Console\Terminal;
$width = (new Terminal())->getWidth();
```
Correct
- 80
The choices were
- 0
- An error
- Nothing
- The width of the actual terminal
- 120
- 80
- 200
Help

https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Console/Terminal.php

80
Status code

What are the HTTP status codes for Server Error?
Correct
- 5xx
The choices were
- 1xx
- 5xx
- 3xx
- 2xx
- 4xx
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
5xx
Network access

Which status code will be returned if a proxy detect that a client must be authenticated to gain network access?
Correct
- 511
The choices were
- 506
- 508
- 404
- 511
- 510
Help
- https://datatracker.ietf.org/doc/html/rfc6585#section-6
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/511
511
Status code

What is the HTTP status codes for HTTP Version Not Supported?
Correct
- 505
The choices were
- 504
- 505
- 503
- 502
- 500
- 501
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
- https://tools.ietf.org/html/rfc2616#section-10.5.6
505
Status code

What is the HTTP status codes for Gateway Timeout?
Correct
- 504
The choices were
- 501
- 502
- 504
- 503
- 505
- 500
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
- https://tools.ietf.org/html/rfc2616#section-10.5.5
504
Status code

What is the HTTP status codes for Bad Gateway?
Correct
- 502
The choices were
- 505
- 502
- 501
- 500
- 504
- 503
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
- https://tools.ietf.org/html/rfc2616#section-10.5.3
502
Status code

What is the HTTP status codes for Not Implemented?
Correct
- 501
The choices were
- 503
- 505
- 500
- 502
- 504
- 501
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
- https://tools.ietf.org/html/rfc2616#section-10.5.2
501
Status code

What is the HTTP status codes for Internal Server Error?
Correct
- 500
The choices were
- 505
- 501
- 500
- 503
- 502
- 504
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
- https://tools.ietf.org/html/rfc2616#section-10.5.1
500
Count function

What will be the output of the following script?
```
<?php
$a = ['foo', 'bar' => 'baz', ['foobar', 'baz']];
echo count($a, true);
```
Correct
- ```
5
```
The choices were
- An error
- ```
2
```
- ```
4
```
- ```
5
```
- ```
3
```
Help
- https://php.net/manual/en/function.count.php
5
Status code

What are the HTTP status codes for client errors?
Correct
- 4xx
The choices were
- 3xx
- 4xx
- 1xx
- 5xx
- 2xx
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
4xx
Legal conditions

Which status code must be used to respond if a resource is unavailable due to legal reasons?
Correct
- 451
The choices were
- 425
- 418
- 401
- 404
- 403
- 451
Help
- https://httpwg.org/specs/rfc7725.html#n-451-unavailable-for-legal-reasons
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/451
451
Status code

What is the status code for Too Many Requests?
Correct
- 429
The choices were
- 431
- 502
- 429
- 420
- 503
Help
- https://tools.ietf.org/html/rfc6585#section-4
429
Status code

What is the status code for Gone?
Correct
- 410
The choices were
- 411
- 403
- 404
- 410
- 409
Help
- https://tools.ietf.org/html/rfc2616#section-10.4.11
410
HTTP code status

What is the status code for Unauthorized ?
Wrong
- 403
The choices were
- 401
- 405
- 402
- 403
Help

https://developer.mozilla.org/fr/docs/Web/HTTP/Status/401
String manipulations

What will be the output of the following code?
```
echo count(explode ('/', '///'));
```
Correct
- ```
4
```
The choices were
- ```
2
```
- An error
- ```
3
```
- ```
0
```
- ```
4
```
Help
- http://php.net/manual/en/function.explode.php
4
Status code

What are the HTTP status codes for redirection?
Correct
- 3xx
The choices were
- 3xx
- 4xx
- 5xx
- 1xx
- 2xx
Help
- https://tools.ietf.org/html/rfc2616#section-6.1.1
3xx
PHP operators

What is the output ?
```
<?php
$a = 4 << 2 + 1;
echo $a;
?>
```
Correct
- 32
The choices were
- 17
- 32
- 1
- 16
- 9
Help

http://php.net/operators.precedence

32
Status code

What is the default status code of a Symfony\Component\HttpFoundation\RedirectResponse object?
Wrong
- 301
The choices were
- 300
- 304
- 301
- 302
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/RedirectResponse.php#L35
- https://tools.ietf.org/html/rfc2616#section-10.3.3
Array functions

What is the output of the following PHP code?
```
<?php
$myArray = [
    0,
    NULL,
    '',
    '0',
    -1
];
echo count(
    array_filter($myArray)
);
```
Wrong
- 3
The choices were
- 3
- An error
- 4
- 1
- 5
Help
Application events

The Application class of the Console component allows you to optionally hook into the lifecycle of a console application via events.

How many events are dispatched?
Wrong
- 3
The choices were
- 6
- 1
- 2
- 4
- 3
- 5
Help

https://symfony.com/doc/5.x/components/console/events.html
Arithmetic Operators

What will be displayed by the following code?
```
var_dump($expressionLanguage->evaluate(
    'life + universe * everything',
    array(
        'life' => 10,
        'universe' => 10,
        'everything' => 22,
    )
));
```
Correct
- 230
The choices were
- 230
- 42
- 440
- true
- 1
Help
- http://php.net/manual/en/language.operators.precedence.php
- http://symfony.com/doc/current/components/expression_language/syntax.html#arithmetic-operators
230
Status code

What is the default status code of a Symfony\Component\HttpFoundation\Response object?
Correct
- 200
The choices were
- 204
- 201
- 400
- 202
- 200
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/Response.php#L127

200
BC promise

When was the Symfony BC promise introduced ?
Correct
- 2.3
The choices were
- 2.0
- 2.6
- 2.9
- 3.2
- 2.8
- 2.3
- 3.3
- 2.1
- 3.0
- 2.7
- 3.1
- 2.4
- 2.2
- 2.5
Help

https://symfony.com/doc/2.8/contributing/code/bc.html

2.3
Cookies

How many HTTP requests (without using JavaScript) are required to determine whether or not a client supports cookies?
Correct
- 2
The choices were
- 2
- This is not possible without javascript.
- 1
- 0
Help
- https://tools.ietf.org/html/rfc7230
2

Reference

What will be the output of the following code?

class Foo {
    public $value = 42;
    public function &getValue() {
        return $this->value;
    }
}
$foo = new Foo;
$myValue = &$foo->getValue();
$foo->value = 2;
echo $myValue;

0
2
42
null

http://php.net/manual/en/language.references.php

PHP variables references

What is the output of the following code ?


function &find_variable(&$one, &$two, &$three) {
    if ($one > 10 && $one < 20) return $one;
    if ($two > 10 && $two < 20) return $two;
    if ($three > 10 && $three < 20) return $three;
}
$one   = 2;
$two   = 20;
$three = 15;
$var = &find_variable($one, $two, $three);
$var++;
print "1: $one, 2: $two, 3: $three";

1:2, 2:20, 3:16

1:2, 2:30, 3:15
1:3, 2:21, 3:16
1:2, 2:20, 3:16
1:3, 2:20, 3:15
1:2, 2:21, 3:15

http://php.net/manual/en/language.references.php

1:2, 2:20, 3:16

Birth

When was PHP first released by Rasmus Lerdorf?
Correct
- 1995
The choices were
- 1995
- 2000
- 2005
- 1987
Help
- http://php.net/manual/en/history.php.php
1995
Array functions

What is the output of the following script?
```
<?php
function reducer($total, $elt)
{
    return $elt + $total;
}
$arr = [1, 2, 3, 4, 5];
echo array_reduce($arr, 'reducer', 1);
```
Wrong
- 15
The choices were
- 4
- 16
- 5
- 15
Help
- https://php.net/array
- https://php.net/manual/en/function.array-reduce.php
Terminal helpers

Given the context where COLUMNS is set as an environment variable with the value of 120, what will be the value returned using the following code?
```
<?php
use Symfony\Component\Console\Terminal;
echo (new Terminal())->getWidth();
```
Correct
- 120
The choices were
- Nothing
- The width of the actual terminal if used in the context of a terminal
- 80
- An error
- 0
- 200
- 120
Help

https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Console/Terminal.php

120
Global variables

Consider the following code snippet:
```
$a = 20;
function my_function($b)
{
    $a = 30;
    global $a, $c;
    return $c = ($b + $a);
}
print my_function(40) + $c;
```
What does this script output when it's executed with PHP?
Correct
- 120
The choices were
- An error saying something like Undefined variable: ....
- 70
- 110
- 60
- 120
Help
- http://php.net/manual/en/language.variables.scope.php
- https://3v4l.org/Jrmgk
120
Worker configuration

What the default sleep option value of the worker?
Correct
- 1000000
The choices were
- 10
- 1000
- 1000000
- 100
Help

https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Messenger/Worker.php#L59

1000000
Arrays

What will be the output of the following code ?
```
$a = [1, 2, 4, 8];
$b = [0, 2, 4, 6, 8, 10];
echo count(array_merge(array_diff($a, $b), array_diff($b, $a)));
```
Wrong
- 10
The choices were
- 4
- 2
- 10
- 8
Help
Code interpretation

What is the output of the following twig code?
```
{% for i in range(1, 10, 2) %}
    {{ i }}{% if not loop.last %},{% endif %}
{% endfor %}
```
Twig
Correct
- 1,3,5,7,9
The choices were
- 1,3,5,7,9
- 2,4,6,8,10
- 1,10,1,10
- 1,2,3,4,5,6,7,8,9,10
Help
- http://twig.symfony.com/doc/functions/range.html
1,3,5,7,9
Parser

What is the output ?
```
<?php
function fsplit()
{
    $spl = 1;
?>
<?php
   echo $spl;
}
fsplit();
```
Correct
- 1
The choices were
- 1
- 2
- Nothing
- Error, function declarations can not be split over multiple PHP segments
Help

http://php.net/manual/en/language.basic-syntax.php

1
Array functions

What is the output ?
```
<?php
$array = [1.1 => '1', 1.2 => '1'];
echo count ($array);
```
Correct
- 1
The choices were
- 4
- 2
- 0
- 1
Help

https://www.php.net/manual/en/language.types.array.php

1
Spaceship operator

Given the following code, what will be displayed?
```
<?php
$a = (object) ['a' => 'b']; 
$b = (object) ['a' => 'c'];
echo $b <=> $a;
```
Correct
- 1
The choices were
- 1
- 0
- -1
Help
1
The printf function

What will be the output of the following script ?
```
$str = printf('%.1f', 1/8);
echo 'Total is ';
echo $str;
```
Correct
- 0.1Total is 3
The choices were
- 3Total is 3
- 1/8Total is 1/8
- 0.1Total is 3
- 0.125Total is 0.1
- 0.125Total is 0.125
Help

http://php.net/manual/en/function.printf.php

0.1Total is 3
Listener priority

What is the priority of the MessageListener->onMessage()?
Correct
- 0
The choices were
- -100
- 0
- 100
- -255
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/Mailer/EventListener/MessageListener.php#L78

0
Spaceship operator

Given the following code, what will be displayed?
```
<?php
$a = (object) ['a' => 'a'];
$b = (object) ['a' => 'a'];
echo $b <=> $a;
```
Correct
- 0
The choices were
- -1
- 0
- 1
Help
0
Compiler passes usage

What is the default priority used when adding a new compiler pass?
Correct
- 0
The choices were
- 1000
- -255
- 0
- 100
- 10
Help
- https://symfony.com/doc/4.1/components/dependency_injection/compilation.html#controlling-the-pass-ordering
- https://github.com/symfony/symfony/blob/4.1/src/Symfony/Component/DependencyInjection/Compiler/PassConfig.php#L113
0
PHP typecasts

What is the output ?
```
echo strcmp(123, '123');
```
Correct
- 0
The choices were
- 1
- 0
- An error
- -1
Help
- http://php.net/manual/en/language.types.type-juggling.php
- http://php.net/manual/fr/function.strcmp.php
0
Process handling

Given a new process created in front of a Symfony command that return a 0 code, what will be returned by Process::mustRun()?
Wrong
- 0
The choices were
- false
- 0
- An instance of Process
- true
- 1
Help

https://github.com/symfony/symfony/blob/2.5/src/Symfony/Component/Process/Process.php#L209
Filesystem

Given /var/www/myfile.txt is a regular file (not a symlink); what does (new Filesystem())->readlink("/var/www/myfile.txt") return ?
Wrong
- /var/www/myfile.txt
The choices were
- null
- /var/www/myfile.txt
- nothing, an exception is thrown
Help
- https://symfony.com/doc/3.2/components/filesystem.html
- https://github.com/symfony/symfony/blob/3.2/src/Symfony/Component/Filesystem/Filesystem.php#L398
Filesystem usage

Given the following code and an existing path set to /srv/app which is a symbolic link to srv/sf, what will be stored in $value?
```
<?php
$fs = new Filesystem();
$value = $fs->readLink('/srv/app', false);
```
Correct
- /srv/sf
The choices were
- An error
- false
- /srv/sf
- /srv/app
- true
Help

https://symfony.com/doc/3.2/components/filesystem.html#readlink

/srv/sf
Identifying a Request

For a request to http://example.com/blog/index.php/post/hello-world, what will be the value of $pathInfo in the following code?
```
$pathInfo = $request->getPathInfo();
```
Correct
- /post/hello-world
The choices were
- example.com/blog/index.php/post/hello-world
- /index.php/post/hello-world
- /post/hello-world
- /blog/index.php/post/hello-world
Help
- http://symfony.com/doc/current/components/http_foundation.html#identifying-a-request
/post/hello-world
Route generation

Given the following definition of the book_list route, what will be the value of the generated URL when calling $router->generate('book_list', ['page' => 2]);?
```
# config/routes.yaml
book_list:
    path:     /books
    controller: 'App\Controller\DefaultController::list'
    methods: [POST]
```
YAML
Correct
- /books?page=2
The choices were
- An error will be thrown
- https://example.com/books?_page=2
- https://example.com/books?page=2
- /books?page=2
- /books?_page=1
Help
- https://github.com/symfony/symfony/blob/3.0/src/Symfony/Component/Routing/Generator/UrlGeneratorInterface.php
/books?page=2

Parameters in route

Given the following definition of the book_list route, what will be the value of the variable $url?

# config/routes.yaml
book_list:
    path:     /books
    controller: 'App\Controller\DefaultController::list'
    methods: [POST]

<?php
namespace App\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
class HomeController extends AbstractController 
{
    public function index() 
    {
        $url = $this->generateUrl('book_list', ['page' => 1]);
        // ...
    }
}

/books?page=1

/books?_page=1
https://example.com/books?page=1
https://example.com/books?_page=1
Error: Parameter "page" is not defined.
/books?page=1

https://symfony.com/doc/4.0/routing.html#generating-urls-with-query-strings

/books?page=1

Optional parameters

What will be the generated URL when calling path('list') from a Twig template?
```
/**
 * @Route(
 *  "/blog/{page}",
 *  name="list",
 *  requirements={"page": "\d+"},
 *  defaults={"page": 1}
 * )
 */
public function list(int $page): Response
{
    // ...
}
```
Wrong
- /blog/1
The choices were
- /blog
- /blog/1
- A MissingMandatoryParametersException will be raised.
- /blog/
Help
- https://symfony.com/doc/2.7/routing/optional_placeholders.html
- https://symfony.com/doc/2.x/reference/twig_reference.html#path
Route matching

According to the following definition of route, which ones are matching?
```
app:
    path: /blog/{page}
    requirements:
        page: \d+
    defaults:
        page: 1
```
YAML
Correct
- /blog
- /blog/
- /blog/1
The choices were
- /blog/1
- /blog/page-1
- /blog
- /blog/
Help
- http://symfony.com/doc/current/book/routing.html#adding-requirements
/blog /blog/ /blog/1
Support of `.gitignore` files when using the Finder

When using the Finder to search for files in a directory, it can be instructed to ignore files and paths excluded from Git using the .gitignore file.

What is the said instruction ?
Wrong
- ```
/** @var \Symfony\Component\Finder\Finder $finder */
$finder->ignoreVCS(true);
```
The choices were
- ```
/** @var \Symfony\Component\Finder\Finder $finder */
$finder->ignoreVCS(true);
```
- ```
/** @var \Symfony\Component\Finder\Finder $finder */
$finder->ignoreVCSIgnored(true);
```
- ```
/** @var \Symfony\Component\Finder\Finder $finder */
$finder->excludeFromGitIgnore(true);
```
Help
- https://symfony.com/doc/current/components/finder.html#version-control-files
- https://symfony.com/blog/new-in-symfony-5-4-misc-features-part-2#recursive-gitignore-support-in-finder
Path usage

Given the following code, what will be displayed?
```
<?php
use Symfony\Component\Filesystem\Path;
echo Path::getRoot("/etc/apache2/sites-available");
```
Correct
- /
The choices were
- /etc/apache2/sites-available
- /
- /etc/apache2
- /etc
- /etc/apache2/
- /etc/
Help
- https://symfony.com/doc/5.4/components/filesystem.html#finding-directories-root-directories
- https://github.com/symfony/filesystem/blob/5.4/Path.php#L207
/
Function calls

Consider the following code snippet:
```
function sum( ??? )
{
    return array_sum($args);
}
echo 6 === sum(1, 2, 3) ? 'Yes' : 'No';
```
What must the ??? placeholder be replaced with in order to make the script print the string Yes on the standard output since PHP 5.6?
Correct
- ...$args
The choices were
- ...$args
- $args
- $args = func_get_args()
- array $args
Help
- http://php.net/manual/en/functions.arguments.php
- http://php.net/manual/en/functions.arguments.php#functions.variable-arg-list
...$args
Debug

What is the console option to display debug message verbosity?
Correct
- -vvv
The choices were
- --debug-messages
- --debug
- -d
- -vvv
Help

https://symfony.com/doc/2.x/console/verbosity.html

-vvv
Listener priority

What is the priority of the EnvelopeListener->onMessage()?
Correct
- -255
The choices were
- 255
- -255
- 0
- -100
- 100
Help

https://github.com/symfony/symfony/blob/4.3/src/Symfony/Component/Mailer/EventListener/EnvelopeListener.php#L59

-255
The spaceship operator.

What will be the output of the following code?
```
$a = (object) ["a" => "b"]; 
$b = (object) ["a" => "c"]; 
echo $a <=> $b;
```
Correct
- -1
The choices were
- -1
- 1
- 0
Help

http://php.net/manual/en/language.operators.comparison.php

-1
Node Type default value

How can you set true as default value for a Node Type ?
Wrong
- ```
->default(true);
```
- ```
->setDefault(true);
```
The choices were
- ```
->defaultTrue();
```
- ```
->isTrue();
```
- ```
->setDefault(true);
```
- ```
->defaultValue(true);
```
- ```
->default(true);
```
Help

https://symfony.com/doc/2.3/components/config/definition.html#default-and-required-values

Table helper: column width

What will be the output of the following command?

// ...
class SomeCommand extends Command
{
    public function execute(InputInterface $input, OutputInterface $output)
    {
        $table = new Table($output);
        $table
            ->setHeaders(['ISBN', 'Title', 'Author'])
            ->setRows([
                ['99921-58-10-7', 'Divine Comedy', 'Dante Alighieri'],
                ['9971-5-0210-0', 'A Tale of Two Cities', 'Charles Dickens'],
                new TableSeparator(),
                ['960-425-059-0', 'The Lord of the Rings', 'J. R. R. Tolkien'],
                ['80-902734-1-6', 'And Then There Were None', 'Agatha Christie'],
            ]);
        $table->setColumnWidth(0, 8);
        $table->setColumnWidth(2, 30);
        $table->render();
    }
}

+---------------+--------------------------+--------------------------------+
| ISBN          | Title                    | Author                         |
+---------------+--------------------------+--------------------------------+
| 99921-58-10-7 | Divine Comedy            | Dante Alighieri                |
| 9971-5-0210-0 | A Tale of Two Cities     | Charles Dickens                |
+---------------+--------------------------+--------------------------------+
| 960-425-059-0 | The Lord of the Rings    | J. R. R. Tolkien               |
| 80-902734-1-6 | And Then There Were None | Agatha Christie                |
+---------------+--------------------------+--------------------------------+

+----------+--------------------------+--------------------------------+
| ISBN     | Title                    | Author                         |
+----------+--------------------------+--------------------------------+
| 99921-58 | Divine Comedy            | Dante Alighieri                |
| 9971-5-0 | A Tale of Two Cities     | Charles Dickens                |
+----------+--------------------------+--------------------------------+
| 960-425- | The Lord of the Rings    | J. R. R. Tolkien               |
| 80-90273 | And Then There Were None | Agatha Christie                |
+----------+--------------------------+--------------------------------+

+---------------+--------------------------+--------------------------------+
| ISBN          | Title                    | Author                         |
+---------------+--------------------------+--------------------------------+
| 99921-58-10-7 | Divine Comedy            | Dante Alighieri                |
| 9971-5-0210-0 | A Tale of Two Cities     | Charles Dickens                |
+---------------+--------------------------+--------------------------------+
| 960-425-059-0 | The Lord of the Rings    | J. R. R. Tolkien               |
| 80-902734-1-6 | And Then There Were None | Agatha Christie                |
+---------------+--------------------------+--------------------------------+

+-------------+--------------------------+--------------------------------+
| ISBN        | Title                    | Author                         |
+-------------+--------------------------+--------------------------------+
| 99921-58... | Divine Comedy            | Dante Alighieri                |
| 9971-5-0... | A Tale of Two Cities     | Charles Dickens                |
+-------------+--------------------------+--------------------------------+
| 960-425-... | The Lord of the Rings    | J. R. R. Tolkien               |
| 80-90273... | And Then There Were None | Agatha Christie                |
+-------------+--------------------------+--------------------------------+

https://symfony.com/doc/current/components/console/helpers/table.html

XPath

Considering the following HTML structure:
```
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
    </head>
    <body bgcolor="test">
        <a href="test.com">Some link</a>
    </body>
</html>
```
HTML
And the following PHP script:
```
$dom = new DomDocument;
$dom->load('test.xml');
$xpath = new DomXPath($dom);
$nodes = $xpath->query(/* ... */);
echo $nodes->item(0)->getAttributeNode('bgcolor')->value;
```
What Xpath query should go in the /* ... */ to display the bgcolor attribute of the first body node in the XML Document ?
Correct
- *[local-name()="body"]
The choices were
- /body[0]/text
- *[local-name()="body"]
- *[lname()="body"]
- name="body"
- /body/body[0]
Help
- https://www.w3.org/TR/1999/REC-xpath-19991116/#function-local-name
- https://www.php.net/manual/fr/class.domxpath.php
*[local-name()="body"]
Process output types

What are valid output types defined in Process?
Correct
- 'err'
- 'out'
The choices were
- 'input'
- 'output'
- 'out'
- 'err'
- 'error'
- 'in'
Help
- https://symfony.com/doc/2.3/components/process.html#getting-real-time-process-output
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Process/Process.php
'err' 'out'

ChoiceType choice_label option

With the following code, what can be set as the value of the choice_label option to display the name property of each choice ?

class Post
{
    private $name;
    public function __construct($name)
    {
         $this->name = $name;
    }
    public function getName()
    {
        return $this->name;
    }
}
$formBuilder->add('posts', ChoiceType::class, [
    'choices' => [new Post('foo'), new Post('bar')]
    'choice_label' => /* ... */
]);

```
'Post::getName'
```
```
'getName'
```

function ($values, $key, $index) {
    return $values[$key];
}

```
'getName'
```
```
'Post::getName'
```

function ($value, $key, $index) {
    return $value->getName();
}

```
'name'
```
```
false
```

https://symfony.com/doc/2.x/reference/forms/types/choice.html#choice-label

Validator

Which of the following values doesn't trigger a violation when the Date constraint is applied to it?
Wrong
- '15/01/2020'
- new \DateTime('2020-01-15')
- '2020-01-15'
The choices were
- '15/01/2020'
- '2020-13-15'
- '15/13/2020'
- null
- new \DateTime('2020-01-15')
- '2020-01-15'
Help
Date Validation

Which of the following values don't trigger a violation when the Date constraint is applied to them?
Wrong
- '15/01/2020'
- new \DateTime('2020-01-15')
- '2020-01-15'
The choices were
- '2020-01-15'
- '15/01/2020'
- '2020-13-15'
- null
- new \DateTime('2020-01-15')
- '15/13/2020'
Help
- https://symfony.com/doc/5.0/reference/constraints/Date.html
- https://github.com/symfony/symfony/blob/5.0/src/Symfony/Component/Validator/Constraints/DateValidator.php
ESI Symfony support

Which ESI (Edge Side Include) element is supported by Symfony?
Correct
- <esi:include src="..."/>
The choices were
- <esi:remove>
- <esi:comment text="..." />
- <esi:inline name="...">
- <esi:include src="..."/>
- <esi:choose>
- <esi:try>
- <esi:vars>
Help

https://symfony.com/doc/6.0/http_cache/esi.html

<esi:include src="..."/>
Escaping

Which will be the output of the following code ?
```
{% set twig = '<h1>Hello from Twig</h1>' %}
{{ twig|raw|escape('html') }}
```
Twig
Correct
- <h1>Hello from Twig</h1>
The choices were
- Hello from Twig
- <h1>Hello from Twig</h1>
- An error
Help

https://twig.symfony.com/doc/1.x/filters/escape.html

<h1>Hello from Twig</h1>
Loading Message Catalogs

What is the way to add a loader to the translator?
Correct
- ```
$translator->addLoader('array', new ArrayLoader());
```
The choices were
- ```
$translator->addArrayLoader(new ArrayLoader());
```
- ```
$translator->addLoader(new ArrayLoader());
```
- ```
$translator->addLoader('array', new ArrayLoader());
```
- ```
$translator->addLoader(new ArrayLoader(), 'array');
```
Help
- https://symfony.com/doc/2.x/components/translation/usage.html
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Translation/Translator.php#L68
$translator->addLoader('array', new ArrayLoader());PHP
Parameters in route

Considering the following definition of route:
```
blog:
    path: /blog/{page}
    controller: 'App\Controller\BlogController::index'
    defaults:
        title: "Hello world!"
```
YAML
How can you retrieve the parameter title?
From the Request object passed by argument to the action of the controller, by writing the following:
Correct
- ```
$title = $request->attributes->get('title');
```
The choices were
- ```
$title = $request->attributes['title'];
```
- ```
$title = $request->getAttributes()['title'];
```
- ```
$title = $request->getAttributes()->get('title');
```
- ```
$title = $request->attributes->get('title');
```
Help
$title = $request->attributes->get('title');PHP

OOP

What statement _______ is missing for this code to display 'bar' as a result ?

class A
{
    protected static $attr = 'foo';
    public static function getAttr()
    {
        return __________;
    }
}
class B extends A
{
    protected static $attr = 'bar';
}
echo B::getAttr();

```
$this->attr
```

```
$this->$attr
```
```
$this->attr
```
```
static::$attr
```
```
self::$attr
```

http://php.net/manual/en/language.oop5.paamayim-nekudotayim.php

Properties

How would one access the $a property from within the commented part of the following code?
```
<?php
class Foo
{
    public $a;
    public function __construct()
    {
        // ...
    }
}
```
Correct
- ```
$this->a;
```
The choices were
- ```
self::$a;
```
- ```
$self->a;
```
- ```
$this->$a;
```
- ```
self->$a;
```
- ```
$this->a;
```
Help
- http://php.net/manual/en/language.oop5.properties.php
$this->a;PHP

Stub

How to make a stub to throw an exception on a method call?

$stub
    ->method('doSomething')
    ->will($this->throwException(new Exception))
;

$stub
    ->method('doSomething')
    ->will(new Exception)
;

$stub
    ->method('doSomething')
    ->willReturn(new Exception)
;

$stub
    ->method('doSomething')
    ->will(throw new Exception)
;

$stub
    ->method('doSomething')
    ->will($this->throwException(new Exception))
;

https://phpunit.de/manual/5.7/en/test-doubles.html#test-doubles.stubs.examples.StubTest8.php

$stub ->method('doSomething') ->will($this->throwException(new Exception)) ;PHP

Array functions

Consider the following PHP script.

<?php
function square($val)
{
    return $val ** 2;
}
$arr = [1, 2, 3, 4];
/** line **/
$i = 0;
foreach ($squares as $value) {
    if ($i++ > 0) {
        echo ".";
    }
    echo $value;
}

What /** line **/ should be used to apply a callback function to every element of an array?

```
$squares = array_map('square', $arr);
```

$squares = call_user_func_array($arr, 'square');

```
$squares = array_map('square', $arr);
```
```
$squares = array_walk($arr, 'square');
```

$squares = call_user_func_array('square', $arr);

$squares = array_map('square', $arr);PHP

Varying the Response for HTTP Cache

Which are the valid ways of caching a Response based not only on the URI but also the value of the Accept-Encoding and User-Agent request headers?

$response->setVary('Accept-Encoding, User-Agent');

$response->setVary(['Accept-Encoding', 'User-Agent']);

$response->headers->set('Vary', 'Accept-Encoding');
$response->headers->set('Vary', 'User-Agent', false);

$response->headers->set('Vary', ['Accept-Encoding', 'User-Agent']);

$response->setVary('Accept-Encoding');
$response->setVary('User-Agent', false);

This is the default behavior

$response->setVary('Accept-Encoding');
$response->setVary('User-Agent');

$response->setVary('Accept-Encoding, User-Agent');

This is not possible without calling a reverse proxy

$response->headers->set('Vary', 'Accept-Encoding');
$response->headers->set('Vary', 'User-Agent', false);

$response->headers->set('Vary', ['Accept-Encoding', 'User-Agent']);

$response->setVary('Accept-Encoding');
$response->setVary('User-Agent', false);

$response->headers->set('Vary', 'Accept-Encoding, User-Agent');

$response->setVary(['Accept-Encoding', 'User-Agent']);

$response->headers->set('Vary', 'Accept-Encoding');
$response->headers->set('Vary', 'User-Agent');

Varying the Response for HTTP Cache

Which are the valid ways of caching a Response based not only on the URI but also the value of the Accept-Encoding and User-Agent request headers?

$response->setVary('Accept-Encoding, User-Agent');

$response->headers->set('Vary', 'Accept-Encoding, User-Agent');

$response->headers->set('Vary', 'Accept-Encoding');
$response->headers->set('Vary', 'User-Agent', false);

$response->setVary(['Accept-Encoding', 'User-Agent']);

$response->headers->set('Vary', 'Accept-Encoding');
$response->headers->set('Vary', 'User-Agent');

This is not possible without calling a reverse proxy

$response->setVary('Accept-Encoding');
$response->setVary('User-Agent');

$response->headers->set('Vary', 'Accept-Encoding, User-Agent');

$response->headers->set('Vary', ['Accept-Encoding', 'User-Agent']);

This is the default behavior

$response->setVary('Accept-Encoding, User-Agent');

$response->setVary('Accept-Encoding');
$response->setVary('User-Agent', false);

Cache

Which of theses are the way to add the Cache-Control: public,s-maxage=900 HTTP response header on a Symfony\Component\HttpFoundation\Response object?
Correct
- ```
$response->setSharedMaxAge(900);
```
The choices were
- ```
$response->setSharedMaxAge(900);
```
- ```
$response->setSMaxAge(900);
```
- ```
$response->setMaxAge(900, true);
```
- ```
$response->setShareMaxAge(900);
```
Help

https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/Response.php#L693

$response->setSharedMaxAge(900);PHP
Setting Cookies

How can one add a cookie named foo with value bar in a Response?
Correct
- ```
$response->headers->setCookie(new Cookie('foo', 'bar'));
```
The choices were
- ```
$request->headers->set('foo', 'bar');
```
- ```
$request->getCookies()->set('foo', 'bar');
```
- ```
$request->get('cookie')->set('foo', 'bar');
```
- ```
$response->headers->setCookie(new Cookie('foo', 'bar'));
```
Help
- http://symfony.com/doc/current/components/http_foundation/introduction.html#setting-cookies
- https://github.com/symfony/symfony/blob/2c14c5fca7182f11abf0a692e471326f14119c29/src/Symfony/Component/HttpFoundation/Cookie.php#L91
$response->headers->setCookie(new Cookie('foo', 'bar'));PHP

OptionsResolver defined options

In which cases the following call will return true?

$resolver->isDefined('username');

```
$resolver->setDefined(['username']);
```
```
$resolver->setDefined('username');
```

```
$resolver->setDefined(['username']);
```
```
$resolver->setRequired('username');
```
```
$resolver->setDefined('username');
```

$resolver->setDefault('username', null);

https://symfony.com/doc/2.x/components/options_resolver.html#options-without-default-values

OptionsResolver defined options

In which cases the following call will return true?

$resolver->isDefined('username');

```
$resolver->setDefined(['username']);
```

$resolver->setDefault('username', null);

```
$resolver->setDefined(['username']);
```
```
$resolver->setRequired('username');
```

$resolver->setDefault('username', null);

```
$resolver->setDefined('username');
```

https://symfony.com/doc/2.x/components/options_resolver.html#options-without-default-values

Option with no default value

How can you add an option named my_option without setting a default value?
Correct
- ```
$resolver->setDefined('my_option');
```
The choices were
- ```
$resolver->setDefined('my_option');
```
- ```
$resolver->setDefault('my_option', null);
```
- ```
$resolver->setNotRequired('my_option');
```
- ```
$resolver->setDefault('my_option');
```
Help
- http://symfony.com/doc/current/components/options_resolver.html#options-without-default-values
$resolver->setDefined('my_option');PHP
Accessing Request Data

How to access $_SERVER data when using a Symfony\Component\HttpFoundation\Request $request object?
Correct
- ```
$request->server
```
The choices were
- ```
$request->server
```
- ```
$request->getServerData()
```
- ```
$request->getServer()
```
- ```
$request->servers
```
- ```
$request->getServersData()
```
Help

https://symfony.com/doc/2.3/components/http_foundation/introduction.html#accessing-request-data

$request->server
Accessing Request Data

How to access $_POST data when using a Symfony\Component\HttpFoundation\Request $request object?
Correct
- ```
$request->request
```
The choices were
- ```
$request->post
```
- ```
$request->request
```
- ```
$request->getPostData()
```
- ```
$request->getPost()
```
Help
- http://symfony.com/doc/current/components/http_foundation.html#accessing-request-data
$request->request
Cookie

How to get a cookie from a $request object?
Wrong
- ```
$request->getCookies->get('key', 'default value');
```
The choices were
- ```
$request->getCookies->get('key', 'default value');
```
- ```
$request->cookies->get('key', 'default value');
```
- ```
$request->get('cookie')->get('key', 'default value');
```
- ```
$request->headers->get('key', 'default value');
```
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/Request.php
- http://symfony.com/doc/current/components/http_foundation/introduction.html#setting-cookies
Request

Which of the following are valid statements to read request data from the Request object?
Correct
- ```
$request->files->get('avatar');
```
- ```
$request->server->get('HTTP_HOST');
```
- ```
$request->headers->get('Accept-Language');
```
The choices were
- ```
$request->session->get('security._last_username');
```
- ```
$request->files->get('avatar');
```
- ```
$request->headers->get('Accept-Language');
```
- ```
$request->server->get('HTTP_HOST');
```
- ```
$request->env->get('CLI_COLOR');
```
Help
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/HttpFoundation/Request.php
- https://symfony.com/doc/2.x/components/http_foundation.html#accessing-request-data
$request->files->get('avatar');PHP $request->server->get('HTTP_HOST');PHP $request->headers->get('Accept-Language');PHP
Accessing Request Data

How to access $_FILES data when using a Symfony\Component\HttpFoundation\Request $request object?
Correct
- ```
$request->files
```
The choices were
- ```
$request->file
```
- ```
$request->getFiles()
```
- ```
$request->getFileData()
```
- ```
$request->getFilesData()
```
- ```
$request->files
```
Help
- http://symfony.com/doc/current/components/http_foundation.html#accessing-request-data
$request->files
Creating a request object.

Which of the following is not a valid way to create an instance of Symfony\Component\HttpFoundation\Request?
Wrong
- ```
$request = new Request(/* ... */);
```
The choices were
- ```
$request = new Request(/* ... */);
```
- ```
$request = Request::createFromGlobals(/* ... */);
```
- ```
$request = Request::createRequestFromFactory(/* ... */);
```
- ```
$request = Request::create(/* ... */);
```
Help

Simulate a Request

How could you simulate a POST request to /login with login parameter set to admin ?

$request = Request::create(
    '/login',
    'POST',
    ['login' => 'admin']
);

$request = Request::create(
    '/login',
   null,
    ['login' => 'admin']
);

$request = Request::create(
    'POST',
    '/login',
    ['login' => 'admin']
);

$request = Request::create(
    '/login',
    'POST',
    ['login' => 'admin']
);

$request = Request::create(
   null,
    '/login',
    ['login' => 'admin']
);

$request = Request::create( '/login', 'POST', ['login' => 'admin'] );PHP

Simulate a Request

How could you simulate a GET request to /hello-world ?
Correct
- ```
$request = Request::create(
    '/hello-world',
    'GET'
);
```
- ```
$request = Request::create(
    '/hello-world'
);
```
The choices were
- ```
$request = Request::create(
    '/hello-world',
    'GET'
);
```
- ```
$request = Request::create(
    'GET',
    '/hello-world'
);
```
- ```
$request = Request::create(
    '/hello-world'
);
```
- ```
$request = Request::create(
    null,
    '/hello-world'
);
```
Help
- https://symfony.com/doc/2.8/components/http_foundation.html#simulating-a-request
- https://github.com/symfony/symfony/blob/88f3ef62d6ab870128352c8686c7889562698faf/src/Symfony/Component/HttpFoundation/Request.php#L316
$request = Request::create( '/hello-world', 'GET' );PHP $request = Request::create( '/hello-world' );PHP
PID

What is the method to access the pid of the running process of the following code :
```
use Symfony\Component\Process\Process;
$process = new Process('/usr/bin/php worker.php');
$process->start();
```
Correct
- ```
$pid = $process->getPid();
```
The choices were
- ```
$pid = $process->getPid();
```
- ```
$pid = $process->getProcessId();
```
- ```
$pid = $process->getData()->getPid();
```
- ```
$pid = $process->getData()->getProcessId();
```
Help
- https://symfony.com/doc/2.x/components/process.html#process-pid
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/Process/Process.php#L337
$pid = $process->getPid();PHP

SQL knowledge

What values in $user or $pass will modify the SQL semantics and lead to SQL injection in the code below ?

$query = "UPDATE users SET password='$pass' WHERE user='$user'";

$pass = "foobar' WHERE user='admin' --";

None

$pass = "foobar' WHERE user='admin' --";

```
$user = "foobar\' WHERE user='admin'";
```

$pass = "\"foobar\" WHERE";
$user = "\"admin\"";

```
$user = "foobar\' WHERE user="admin"";
```

http://php.net/manual/fr/security.database.sql-injection.php

$pass = "foobar' WHERE user='admin' --";PHP

OptionsResolver and callable with default values

What happens if you remove the type-hint Options of $options, in the callable below?
```
$resolver->setDefault('port', function (Options $options) {
    if ('ssl' === $options['encryption']) {
        return 465;
    }
    return 25;
});
```
Wrong
- $options will automatically be casted to a nullable array
The choices were
- Nothing special
- $options will automatically be casted to a nullable array
- A fatal error is thrown because of the lack of type-hint
- The callable itself will be considered as the default value
Help

https://symfony.com/doc/6.2/components/options_resolver.html#default-values-that-depend-on-another-option
Array functions

How do you add the value 10 to an array called $myArray?
Wrong
- ```
$myArray = array_merge($myArray, [10]);
```
- ```
array_shift($myArray, 10);
```
The choices were
- ```
$myArray = array_merge($myArray, 10);
```
- ```
array_unshift($myArray, 10);
```
- ```
$myArray = array_merge($myArray, [10]);
```
- ```
array_shift($myArray, 10);
```
Help

Passing in Variables

What is the way to return Honeycrisp with the following code?

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
$language = new ExpressionLanguage();
class Apple
{
    public $variety;
}
$apple = new Apple();
$apple->variety = 'Honeycrisp';

$language->evaluate(
    'fruit.variety',
    array(
        'fruit' => $apple,
    )
);

$language->evaluate('apple.variety', $apple);

$language->evaluate(
    'fruit.variety',
    array(
        'fruit' => $apple,
    )
);

```
$language->evaluate('variety', $apple);
```

$language->compile('apple.variety', $apple);

http://symfony.com/doc/current/components/expression_language.html#passing-in-variables

$language->evaluate( 'fruit.variety', array( 'fruit' => $apple, ) );PHP

Array counting

What is the most recommended way to count the number of occurences of each unique value in the following array?

<?php
$a = [1, 1, 2, 3, 4, 4, 5, 6, 6, 6, 6, 3, 2, 2, 2];

$k = array_unique($a);
$v = array_fill(0, count($k), 0);
$n = array_combine($k, $v);
reset($a);
for ($i = 0; $i < count($a); $i++) {
    ++$n[current($a)];
    next($a);
}

$k = array_unique($a);
$v = array_fill(0, count($k), 0);
$n = array_combine($k, $v);
foreach ($a as $i) {
    ++$n[$i];
}

```
$n = array_count_values($a);
```
```
$n = array_total_values($a);
```

$k = array_unique($a);
$v = array_fill(0, count($k), 0);
$n = array_combine($k, $v);
reset($a);
for ($i = 0; $i < count($a); $i++) {
    ++$n[current($a)];
    next($a);
}

```
$n = count($a);
```

Array counting

What is the most recommended way to count the number of occurences of each unique value in the following array?

<?php
$a = [1, 1, 2, 3, 4, 4, 5, 6, 6, 6, 6, 3, 2, 2, 2];

$k = array_unique($a);
$v = array_fill(0, count($k), 0);
$n = array_combine($k, $v);
foreach ($a as $i) {
    ++$n[$i];
}

```
$n = count($a);
```

$k = array_unique($a);
$v = array_fill(0, count($k), 0);
$n = array_combine($k, $v);
reset($a);
for ($i = 0; $i < count($a); $i++) {
    ++$n[current($a)];
    next($a);
}

```
$n = array_count_values($a);
```
```
$n = array_total_values($a);
```

$k = array_unique($a);
$v = array_fill(0, count($k), 0);
$n = array_combine($k, $v);
foreach ($a as $i) {
    ++$n[$i];
}

Absolute path

What is the Symfony\Component\Filesystem\Filesystem method to check if the given path is absolute ?
Correct
- ```
$fs->isAbsolutePath('/tmp');
```
The choices were
- ```
$fs->isAbsolutePath('/tmp');
```
- ```
$fs->checkAbsolutePath('/tmp');
```
- ```
$fs->isAbsolute('/tmp');
```
- ```
$fs->absolutePath('/tmp');
```
Help

http://symfony.com/doc/current/components/filesystem.html#isabsolutepath

$fs->isAbsolutePath('/tmp');PHP
Dump contents to a file

What is the Symfony\Component\Filesystem\Filesystem method to dump contents to a file?
Correct
- ```
$fs->dumpFile('file.txt', 'Hello World');
```
The choices were
- ```
$fs->dumpFile('file.txt', 'Hello World');
```
- ```
$fs->dumpToFile('file.txt', 'Hello World');
```
- ```
$fs->dump('file.txt', 'Hello World');
```
- ```
$fs->file('file.txt', 'Hello World');
```
Help

http://symfony.com/doc/current/components/filesystem.html#dumpfile

$fs->dumpFile('file.txt', 'Hello World');PHP

RangeType options

Which of the following snippets is valid to set the maximum and minimum value for a Symfony\Component\Form\Extension\Core\Type\RangeType form type ?

$formBuilder->add('name', RangeType::class, [
    'attr' => [
        'min' => 5,
        'max' => 50
    ]
]);

$formBuilder->add('name', RangeType::class, [
    'attr' => [
        'minimum' => 5,
        'maximum' => 50
    ]
]);

$formBuilder->add('name', RangeType::class, [
    'attr' => [
        'min' => 5,
        'max' => 50
    ]
]);

$formBuilder->add('name', RangeType::class, [
    'minimum' => 5,
    'maximum' => 50
]);

$formBuilder->add('name', RangeType::class, [
    'min' => 5,
    'max' => 50
]);

http://symfony.com/doc/current/reference/forms/types/range.html

$formBuilder->add('name', RangeType::class, [ 'attr' => [ 'min' => 5, 'max' => 50 ] ]);PHP

Submitting a Form

Which method of a Symfony\Component\Form\Form instance is the most recommended one to invoke in order to process a form in a Symfony controller?
Correct
- $form->handleRequest(...);
The choices were
- $form->validate(...);
- $form->submit(...);
- $form->handleRequest(...);
- $form->bind(...);
- $form->process(...);
Help

https://symfony.com/doc/2.8/forms.html#handling-form-submissions

$form->handleRequest(...);

Reading from Arrays

What is the way to get the value of the first_name index of the $person array?

$person = array(
    'first_name' => 'Wouter',
);

$firstName = $accessor->getValue($person, 'first_name');

$firstName = $accessor->readProperty($person, 'first_name');

$firstName = $accessor->getValue($person, '[first_name]');

$firstName = $accessor->readIndex($person, 'first_name');

$firstName = $accessor->getValue($person, 'first_name');

http://symfony.com/doc/current/components/property_access/introduction.html#reading-from-arrays

Finder depth

Which solution will match /home/me/myFile.txt file ?

```
$finder->in('/home/me')->depth('== 0');
```
```
$finder->in('/home/me');
```

$finder->files()->in('/home')->depth('< 1');

```
$finder->in('/home/me')->depth('== 0');
```
```
$finder->files()->in('/home');
```
```
$finder->in('/home/me');
```

$finder->directories()->in('/home')->depth('== 1');

$finder->files()->in('/home')->depth('> 1');

https://symfony.com/doc/current/components/finder.html#directory-depth

Finder depth

Which solution will match /home/me/myFile.txt file ?

```
$finder->in('/home/me')->depth('== 0');
```

$finder->files()->in('/home')->depth('> 1');

```
$finder->files()->in('/home');
```
```
$finder->in('/home/me');
```

```
$finder->in('/home/me')->depth('== 0');
```
```
$finder->files()->in('/home');
```

$finder->files()->in('/home')->depth('< 1');

$finder->directories()->in('/home')->depth('== 1');

$finder->files()->in('/home')->depth('> 1');

```
$finder->in('/home/me');
```

https://symfony.com/doc/current/components/finder.html#directory-depth

VCS Files

By default, the Finder ignores popular VCS files, what is the method to use them ?
Correct
- ```
$finder->ignoreVCS(false);
```
The choices were
- ```
$finder->ignoreFiles(array('vcs' => false));
```
- ```
$finder->enableVCSFiles();
```
- ```
$finder->ignoreVCS(false);
```
- ```
$finder->useTypes(array('vcs' => true);
```
- ```
$finder->enableVCS();
```
Help

https://symfony.com/doc/2.7/components/finder.html#files-or-directories

$finder->ignoreVCS(false);PHP

Finder depth

Which solution will match /home/me/myFile.txt file ?

$finder->files()->in('/home')->depth('< 1');

```
$finder->files()->in('/home');
```

$finder->files()->in('/home')->depth('< 1');

```
$finder->in('/home/me')->depth('== 0');
```
```
$finder->in('/home/me');
```
```
$finder->files()->in('/home');
```

$finder->directories()->in('/home')->depth('== 1');

$finder->files()->in('/home')->depth('> 1');

https://symfony.com/doc/current/components/finder.html#directory-depth

PHP DOM

What should ????? be replaced with to add a <title> node with the value of "Hello, World!"?

$title = $dom->createElement('title');
$node = ?????????
$title->appendChild($node);
$head->appendChild($title);

```
$dom->createTextNode('Hello, World!');
```

```
$dom->createTextNode('Hello, World!');
```
None of the above

$dom->appendTextNode($title, "Hello, World!");

$dom->createElement('text', 'Hello, World!');

$dom->appendElement($title, 'text', 'Hello, World!');

$dom->createTextNode('Hello, World!');PHP

Connecting Listeners

How can you register the AcmeListener to the EventDispatcher in order to call the onFooAction method when the acme.action event is dispatched with the following code?
```
<?php
use Symfony\Component\EventDispatcher\EventDispatcher;
$dispatcher = new EventDispatcher();
$listener = new AcmeListener();
```
Correct
- ```
$dispatcher->addListener('acme.action', array($listener, 'onFooAction'));
```
The choices were
- ```
$dispatcher->addListener('acme.action', $listener, 'onFooAction');
```
- ```
$dispatcher->addListener('acme.action', array($listener, 'onFooAction'));
```
- ```
$dispatcher->registerListener('acme.action', $listener, 'onFooAction');
```
- ```
$dispatcher->registerListener('acme.action', array($listener, 'onFooAction'));
```
Help
- http://symfony.com/doc/current/components/event_dispatcher/introduction.html#connecting-listeners
- https://github.com/symfony/symfony/blob/e71d4713c506686e6cf027af44c97ee5d94c7db4/src/Symfony/Component/EventDispatcher/EventDispatcher.php#L102
$dispatcher->addListener('acme.action', array($listener, 'onFooAction'));PHP
Find by date

It's 10AM, which values of $date Symfony\Component\Finder\Finder::date($date) will find a file modified yesterday at 9AM ?
Wrong
- ```
$date = 'yesterday';
```
- ```
$date = 'until 1 day';
```
- ```
$date = 'before yesterday';
```
- ```
$date = 'before 1 day';
```
The choices were
- ```
$date = 'since yesterday';
```
- ```
$date = 'until 1 day';
```
- ```
$date = 'yesterday';
```
- ```
$date = 'before 1 day';
```
- ```
$date = 'before yesterday';
```
- ```
$date = 'after 1 day ago';
```
- ```
$date = 'after 2 days ago';
```
Help
- https://symfony.com/doc/2.3/components/finder.html#file-date
- https://www.php.net/manual/en/datetime.formats.php#datetime.formats.relative
Find by date

It's 10AM, which values of $date Symfony\Component\Finder\Finder::date($date) will find a file modified yesterday at 9AM ?
Wrong
- ```
$date = 'before yesterday';
```
- ```
$date = 'before 1 day';
```
The choices were
- ```
$date = 'yesterday';
```
- ```
$date = 'until 1 day';
```
- ```
$date = 'before 1 day';
```
- ```
$date = 'after 1 day ago';
```
- ```
$date = 'after 2 days ago';
```
- ```
$date = 'before yesterday';
```
- ```
$date = 'since yesterday';
```
Help
- https://symfony.com/doc/2.3/components/finder.html#file-date
- https://www.php.net/manual/en/datetime.formats.php#datetime.formats.relative

Service definition

With the following service definition how is it possible to access the mailer service?

services:
    app.mailer.one:
        class: App\OneMailer
        arguments: [sendmail]
        public: false
    app.mailer:
        alias: app.mailer.one
        public: true

```
$container->get('app.mailer');
```

```
$container->get('app.mailer.one');
```
It is not possible.
```
$container->get('app.mailer');
```

https://symfony.com/doc/current/components/dependency_injection/advanced.html#aliasing

$container->get('app.mailer');PHP

Max retries configuration

How can you control the maximum number of retry attempts with Symfony\Component\HttpClient\RetryableHttpClient?

$client = new RetryableHttpClient(HttpClient::create());
$client = $client->withOptions(['max_retries' => 4]);

$client = new RetryableHttpClient(HttpClient::create(), null, 4);

$client = new RetryableHttpClient(HttpClient::create(), null, 4);

$client = new RetryableHttpClient(HttpClient::create(), null, ['max_retries' => 4]);

$client = new RetryableHttpClient(HttpClient::create());
$client->request('GET', '/some/url', ['max_retries' => 4]);

$client = new RetryableHttpClient(HttpClient::create());
$client = $client->withOptions(['max_retries' => 4]);

DataTransformer

How to add a DataTransformer to the tags field?


$builder->add(
    $builder
        ->create('tags', TextType::class)
        ->addModelTransformer(...)
);

$builder->add('tags', TextType::class);
$builder->get('tags')
        ->addModelTransformer(...);

$builder->add('tags', TextType::class)
        ->addModelTransformer(...);


$builder->add(
    $builder
        ->create('tags', TextType::class)
        ->addModelTransformer(...)
);

$builder->add('tags', TextType::class);
$builder->get('tags')
        ->addModelTransformer(...);

http://symfony.com/doc/current/form/data_transformers.html#simple-example-transforming-string-tags-from-user-input-to-an-array

$builder->add( $builder ->create('tags', TextType::class) ->addModelTransformer(...) );PHP $builder->add('tags', TextType::class); $builder->get('tags') ->addModelTransformer(...);PHP

Magic __call() Method

What is the way to enable magic __call method?

$accessor = PropertyAccess::createPropertyAccessorBuilder()
    ->enableMagicCall()
    ->getPropertyAccessor()
;

$accessor = PropertyAccess::createPropertyAccessorBuilder()
    ->getPropertyAccessor(true)
;

$accessor = PropertyAccess::createPropertyAccessorBuilder()
    ->enableMagicCall()
    ->getPropertyAccessor()
;

$accessor = PropertyAccess::createPropertyAccessor(true);

$accessor = PropertyAccess::createPropertyAccessor()
    ->enableMagicCall()
;

http://symfony.com/doc/current/components/property_access/introduction.html#magic-call-method

$accessor = PropertyAccess::createPropertyAccessorBuilder() ->enableMagicCall() ->getPropertyAccessor() ;PHP

Comparison operators.

Which of the following operators is also known as the Elvis operator?
Correct
- ```
$a ?: $b
```
The choices were
- ```
$a ?: $b
```
- ```
$a <=> $b
```
- ```
$a ** $b
```
Help
- https://en.wikipedia.org/wiki/Elvis_operator#PHP
$a ?: $bPHP
Predefined variables

From which global arrays is it possible to read submitted form data?
Wrong
- $_GET
- $_POST
The choices were
- $_POST
- $_GET
- $_COOKIE
- $_REQUEST
- $_SESSION
- $_ENV
Help
Dotenv

Given you have an already register env var MYVAR=foo in your shell and you load MYVAR=bar from a .env file via the Dotenv component. What will happen ?
Wrong
- $_ENV['MYVAR'] will be equal to bar
- getenv('MYVAR') will return bar
The choices were
- $_ENV['MYVAR'] will be equal to bar
- $_ENV['MYVAR'] will be equal to foo
- getenv('MYVAR') will return bar
- an exception will be thrown
- getenv('MYVAR') will return foo
Help
- https://symfony.com/doc/3.3/components/dotenv.html
CLI PHP

Which PHP superglobal variable contains the command line arguments when the script runs in CLI mode?
Wrong
- $_ENV
The choices were
- $_SERVER
- $_POST
- PHP cannot run from the command line interface.
- $_CLI
- $_ENV
Help
- http://php.net/manual/en/language.variables.superglobals.php
Security

Which of the following list of potential data sources should be considered trusted ?
Wrong
- $_ENV
The choices were
- $_COOKIE
- $_SERVER
- None
- $_ENV
- $_POST
Help

http://php.net/manual/en/security.php
Composer + Symfony

Which of the following Composer commands is recommended to execute on production servers to increase the performance of your Symfony applications?
Wrong
- $ composer dump-autoload --optimize --apc-class-autoload
The choices were
- $ composer optimize-autoload --no-dev
- $ composer optimize-autoload
- $ composer dump-autoloader --optimize --no-dev
- $ composer dump-autoload --optimize --no-dev --classmap-authoritative
- $ composer dump-autoload --optimize --apc-class-autoload
Help
- http://symfony.com/doc/current/performance.html
- https://getcomposer.org/doc/articles/autoloader-optimization.md

Serialization Context

How to specify the date format for a date attribute in a serialization context ?


    #[Serializer\Context([DateTimeNormalizer::FORMAT_KEY => 'Y-m-d'])]
    public \DateTime $date;


    /**
     * @Serializer\Context({ DateTimeNormalizer::FORMAT_KEY = 'Y-m-d' })
     */
    public \DateTime $date;


    /**
     * @Serializer\Context({ DateTimeNormalizer::FORMAT_KEY = 'Y-m-d' })
     */
    public \DateTime $date;

It's not possible


    #[Serializer\Context([DateTimeNormalizer::FORMAT_KEY => 'Y-m-d'])]
    public \DateTime $date;


    /**
     * @Serializer\DateFormat('Y-m-d' )
     */
    public \DateTime $date;

https://symfony.com/blog/new-in-symfony-5-3-inlined-serialization-context

#[Serializer\Context([DateTimeNormalizer::FORMAT_KEY => 'Y-m-d'])] public \DateTime $date; PHP /** * @Serializer\Context({ DateTimeNormalizer::FORMAT_KEY = 'Y-m-d' }) */ public \DateTime $date;PHP

Routing default values

Which of the following allows to give a default value to a route parameter ?

#[Route('/blog/posts/page/{page}', name:"paginated_posts", defaults:['page' => 1])]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts")]
public function postPages(int $page=1): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts", defaults:['page' => 1])]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page?1}', name:"paginated_posts")]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page?default=1}', name:"paginated_posts")]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts")]
public function postPages(int $page=1): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts", page:['defaults' => 1])]
public function postPages(int $page): Response

https://symfony.com/doc/6.3/routing.html

Routing default values

Which of the following allows to give a default value to a route parameter ?

#[Route('/blog/posts/page/{page?default=1}', name:"paginated_posts")]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts", defaults:['page' => 1])]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts")]
public function postPages(int $page=1): Response

#[Route('/blog/posts/page/{page?default=1}', name:"paginated_posts")]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts")]
public function postPages(int $page=1): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts", page:['defaults' => 1])]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page?1}', name:"paginated_posts")]
public function postPages(int $page): Response

#[Route('/blog/posts/page/{page}', name:"paginated_posts", defaults:['page' => 1])]
public function postPages(int $page): Response

https://symfony.com/doc/6.3/routing.html

Serializer

Given the following denormalization attempt:

class ValueObject
{
  private $foo;
  public function __construct($bar)
  {
    $this->foo = $bar;
  }
  public function getFoo()
  {
    return $this->foo;
  }
}
$normalizer = new GetSetMethodNormalizer();
$vo = $normalizer->denormalize(['bar' => 'symfony'], ValueObject::class);
echo $vo->getFoo();

What will be displayed ?

"symfony"

"symfony"
nothing, an exception will be thrown
an empty string

https://github.com/symfony/symfony/blob/8c778cbaa30db02fee9d972badcac834b51da0fa/src/Symfony/Component/Serializer/Normalizer/AbstractNormalizer.php#L369

"symfony"

setAllowedTypes

Which of the following are valid types to use in setAllowedTypes method of Symfony\Component\OptionsResolver\OptionsResolver to validate a integer value?
Correct
- ```
"integer"
```
- ```
"int"
```
The choices were
- ```
OptionsResolver::INT
```
- ```
"int"
```
- ```
OptionsResolver::INTEGER
```
- ```
"integer"
```
Help
- https://symfony.com/doc/2.3/components/options_resolver.html#configure-allowed-types
- https://github.com/symfony/symfony/blob/2.3/src/Symfony/Component/OptionsResolver/OptionsResolver.php
"integer"PHP "int"PHP
setAllowedTypes

Which of the following are valid types to use in setAllowedTypes method of Symfony\Component\OptionsResolver\OptionsResolver to validate a boolean value?
Correct
- ```
"boolean"
```
- ```
"bool"
```
The choices were
- ```
OptionsResolver::BOOLEAN
```
- ```
"bool"
```
- ```
OptionsResolver::BOOL
```
- ```
"boolean"
```
Help
- https://symfony.com/doc/3.0/components/options_resolver.html#type-validation
- https://github.com/symfony/symfony/blob/3.0/src/Symfony/Component/OptionsResolver/OptionsResolver.php
"boolean"PHP "bool"PHP

Nulls elements

Correct

The choices were

Help

Twig operator precedence

Correct

The choices were

Help

Functions usage

Correct

The choices were

Help

Escaping

Correct

The choices were

Help

Get value

Correct

The choices were

Help

Evaluating Expressions in Twig

Correct

The choices were

Help

Get current route

Wrong

The choices were

Help

Twig

Wrong

The choices were

Help

Twig delimiters

Correct

The choices were

Help

String concatenation

Wrong

The choices were

Help

Checking if constants are defined

Correct

The choices were

Help

String concatenation

Wrong

The choices were

Help

HttpClient

Correct

The choices were

Help

PHP Iteration

Correct

The choices were

Help

Date Handling

Wrong

The choices were

Help

Redirect Response

Wrong

The choices were

Help

Security

Correct

The choices were

Help

Ignoring Attributes

Correct

The choices were

Help

PHP constant

Correct

The choices were

Help

Handling Arrays

Wrong

The choices were

Help