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University Sensiolabs - Reminder

What is the attribute in the definition of a route setting the locale of a user?

Answer: _locale

When declaring a route in PHP, what is the 4th argument of the constructor of the Route class?

Answer: An array of options.

http://symfony.com/doc/current/components/routing.html#defining-routes

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Routing/Route.php#L75-L82

How to get the current route name from Twig?

Answer:

{{ app.request.attributes._route }}

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);
}

Answer: An empty string

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Validator/ConstraintViolationList.php#L38-L52

Which of the followings are not validation constraints?

Answer:

  • Password (UserPassword)
  • File
  • Search
  • All

http://symfony.com/doc/current/reference/constraints.html

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;

Answer: 2

http://php.net/manual/en/language.references.php

http://php.net/manual/fr/language.references.return.php

What are the valid ways to get the Session object if the controller class inherits from the base FrameworkBundle's Controller class?

  • $session = $this->getSession();
  • $session = $request->getSession();
  • $session = $this->getUser()->getSession();
  • $session = $this->container->getSession();
  • $session = $this->get('session');

http://symfony.com/doc/current/book/controller.html#managing-the-session

http://symfony.com/doc/current/service_container/third_party.html

Which Dumper is not available in the VarDumper component?

Answer:

  • HtmlDumper
  • HttpDumper
  • CliDumper

http://symfony.com/doc/current/components/var_dumper/advanced.html#dumpers

What is the aim of the security switch_user option?

  • To be able to have several accounts and switch easily.
  • To let some user be able to switch from to another.
  • To change the roles of the user easily.

http://symfony.com/doc/current/security/impersonating_user.html

Can interfaces define constants in PHP?

Answer: Yes

What is the config option of web_profiler to display a debug page of a RedirectResponse?

Answer:

intercept_redirects: true

http://symfony.com/doc/current/reference/configuration/web_profiler.html#full-default-configuration

http://symfony.com/doc/current/cookbook/email/dev_environment.html#viewing-from-the-web-debug-toolbar

What will be the output of the following code?

<?php
echo count(explode ('/', '///'));

Answer: 4

http://php.net/manual/en/function.explode.php

How can you get a random value of the following array?

$tab = array('foo', 'key' => 'bar', 'baz', 36);

Answer:

  • array_rand(array_flip($tab))
  • array_shuffle($tab)
  • $tab[array_rand($tab)]
  • $tab[shuffle($tab)]
  • array_rand($tab)

http://php.net/manual/en/function.array-flip.php

http://php.net/manual/en/function.array-rand.php

http://php.net/manual/en/function.shuffle.php

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?

Answer:

$response->setSharedMaxAge(900);

http://symfony.com/doc/current/book/http_cache.html#expiration-with-the-cache-control-header

http://symfony.com/doc/current/http_cache/expiration.html

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpFoundation/Response.php#L771-L802

When is executed the Symfony\Component\Console\Command::interact method?

Answer:

  • Before Symfony\Component\Console\Command::initialize method.
  • Before the InputDefinition is validated.
  • After Symfony\Component\Console\Command::initialize method.
  • After the InputDefinition is validated.
  • Before Symfony\Component\Console\Command::execute method.
  • After Symfony\Component\Console\Command::execute method.

The InputDefinition is bound first, and its validation starts after Symfony\Component\Console\Command::interact

http://symfony.com/doc/current/console.html#command-lifecycle

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Console/Command/Command.php#L212-L259

Does the order of the controller arguments matter when mapping route parameters to controller arguments?

Answer: No

http://symfony.com/doc/current/controller.html#the-request-object-as-a-controller-argument

How to get information on the route foobar of an application?

Answer:

  • bin/console debug:router foobar
  • bin/check.php foobar
  • It is not possible to do this.
  • bin/console router:debug foobar
  • bin/debug.php foobar

http://symfony.com/doc/current/routing/debug.html

Following best practices, where should be stored a Bundle documentation?

Answer: Acme/Bundle/DemoBundle/Resources/doc/

http://symfony.com/doc/current/bundles/best_practices.html#documentation

Considering the following in a template: {{ path('home') }}

With the following declaration of route:
      <routes>
          <route id="home" path="/" schemes="https">
              <default key="_controller">AppBundle:Main:home</default>
          </route>
      </routes>

What is displayed if the current scheme is http?

Answer: https://domain.name/

http://symfony.com/doc/current/templating.html#linking-to-pages

How can you add an option named my_option without setting a default value?

Answer:

$resolver->setDefined('my_option');

http://symfony.com/doc/current/components/options_resolver.html#options-without-default-values

What will be the output of the following script?

<?php
$a = array('foo', 'bar' => 'baz', array('foobar', 'baz'));
echo count($a, true);

Answer: 5

http://php.net/manual/en/function.count.php

What is the output of the following controller?

class HelloController
{
    public function helloAction()
    {
        $filename = tempnam(sys_get_temp_dir(), 'sf');
        file_put_contents($filename, 'hello {{ 1 + 1 }}');

        return $this->forward('FrameworkBundle:Template:template', [
            'template' => $filename
        ]);
    }
}

Answer: hello 2

http://symfony.com/doc/current/cookbook/templating/render_without_controller.html

https://github.com/symfony/symfony/blob/master/src/Symfony/Bundle/FrameworkBundle/Controller/TemplateController.php#L27-L57

http://php.net/tempnam

What is the way to enable magic __call method?

Answer:

$accessor = PropertyAccess::createPropertyAccessorBuilder()
    ->enableMagicCall()
    ->getPropertyAccessor()
;

http://symfony.com/doc/current/components/property_access/introduction.html#magic-call-method

Which of these are Standard (not Long Term Support) Versions of Symfony?

Answer:

  • 3.2
  • 3.3
  • 3.1
  • 3.4 (LTS)
  • 3.0

http://symfony.com/doc/current/contributing/community/releases.html#standard-versions

http://symfony.com/doc/current/contributing/community/releases.html#long-term-support-versions

What does the 308 HTTP status code stand for?

Answer: Permanent redirect

https://www.wikiwand.com/fr/Liste_des_codes_HTTP#/Redirection

What is returned by $dispatcher->dispatch('bar.event', $event) in the following code?

$event = new OrderPlacedEvent($order);
$dispatcher->dispatch('bar.event', $event);

Answer: $event

http://symfony.com/doc/2.3/components/event_dispatcher/introduction.html#dispatcher-shortcuts

In which cases the following call will return true

$resolver->isDefined('username');

Answer:

  • $resolver->setDefined('username');
  • $resolver->setRequired('username');
  • $resolver->setDefined(array('username'));
  • $resolver->setDefault('username');

http://symfony.com/doc/current/components/options_resolver.html#options-without-default-values

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/OptionsResolver/OptionsResolver.php#L316-L340

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

Answer:

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

http://symfony.com/doc/current/components/translation/custom_formats.html

Can you configure your routes in PHP?

Answer: Yes

http://symfony.com/doc/current/routing.html#routing-examples

What does the affirmative strategy of AccessDecisionManager?

Answer:

  • Grant access if there are more voters granting access than there are denying. (consensus)
  • Grant access as soon as there is one voter granting access.
  • Only grant access if none of the voters has denied access. (unanimous)

http://symfony.com/doc/current/components/security/authorization.html#access-decision-manager

Considering the following declaration of route in YAML:

contact:
    path:     /contact
    defaults: { _controller: AppBundle:Default:test }
    condition: "context.getMethod() in ['GET', 'HEAD'] and request.headers.get('User-Agent') matches '/firefox/i'"

If the user tries to display the page by typing http://domain.name/contact with his regular Chrome browser, does he/she will have a 404 response?

Answer: Yes

http://symfony.com/doc/2.6/book/routing.html#completely-customized-route-matching-with-conditions

Is the translation activated by default?

Answer: No

http://symfony.com/doc/current/book/translation.html#configuration

How can you disable the validation in a form?

Answer:

  • With the no_validation option set to true
  • By calling isValid(false)
  • By not calling isValid()
  • With the validation_groups option set to false

http://symfony.com/doc/current/form/disabling_validation.html

Which type does not correspond to a button?

Answer:

  • reset
  • button
  • input
  • submit

What is the default domain for form label?

Answer: messages

http://symfony.com/doc/current/reference/forms/types/form.html#translation-domain

Which of theses are not options available in every FormType?

Answer:

  • by_reference
  • trim
  • compound
  • attributes
  • action
  • is_required (required)

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

What are the ways to retrieve the Request in an action?

Answer:

  • Add a type-hinted argument, object of type Request, to the action.
  • Add the @Request annotation on the action.
  • Get the service request via the Container.
$this->get('request');
  • Via a call to the request_stack service:
$this->get('request_stack')->getCurrentRequest();
  • Via a call to the routing service:
$this->get('router')->getRequest();

http://symfony.com/doc/current/book/controller.html#the-request-object-as-a-controller-argument

http://symfony.com/doc/master/service_container/request.html

What two caching models define the HTTP specification?

Answer:

  • Validation model
  • Confirmation model
  • Expiration model
  • Invalidation model

https://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html

Is it possible to pass a Response instance to the Symfony\Bundle\FrameworkBundle\Controller\Controller::render() method?

Answer: Yes

Is the following code valid?

<?php
class Article
{
    public string $title;
}

Answer: No - Note: there is a pending RFC to add this feature to future PHP versions. See details :

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

What will be the last version of Symfony 3?

Answer: 3.4

http://symfony.com/roadmap?version=3.8#checker

Among the following which ones are escaped?

Answer:

  • {{ var|raw|upper }}
  • {{ var|upper|raw }}
  • {{ var|raw~bar }}

Note: raw must be used before the other filters

http://twig.sensiolabs.org/doc/filters/raw.html

How can you get the HTTP client user-agent?

Answer:

$_SERVER['HTTP_USER_AGENT'];

http://php.net/manual/en/reserved.variables.server.php

Which of the following are Filesystem methods?

Answer:

  • remove
  • move
  • makePathRelative
  • isAbsolutePath
  • exists
  • symlink

http://symfony.com/doc/current/components/filesystem/introduction.html#usage

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

Which of the following will not be correctly encoded by the JSON extension?

Answer:

  • array(array("foo"=>"bar"))
  • 'foo bar'
  • function () {alert("foo");}
  • new SomeClass('some string')

http://php.net/manual/en/book.json.php

What will be the output of the following code?

$a = (object) ["a" => "b"]; 
$b = (object) ["a" => "c"]; 
echo $a <=> $b;

Answer:

  • 0
  • 1
  • -1

http://php.net/manual/en/language.operators.comparison.php

http://stackoverflow.com/questions/30365346/what-is-the-spaceship-operator-in-php-7#answer-30365399

What is the first argument of the Symfony\Component\Config\FileLocator::locate method?

Answer: The name of the file to look for.

http://symfony.com/doc/current/components/config/resources.html#locating-resources

What is the name of the service that check authorization?

Answer: security.authorization_checker

http://symfony.com/blog/new-in-symfony-2-6-security-component-improvements

Which of theses is the correct way to use the Security annotation to secure a Controller with the ROLE_ADMIN?

Answer: @Security("has_role('ROLE_ADMIN')")

http://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/security.html

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?

Answer:

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');

http://symfony.com/doc/3.0/components/serializer.html#handling-arrays

What is the default domain for validation message?

Answer:

  • messages
  • validation
  • validators
  • default
  • validator

http://symfony.com/doc/current/reference/configuration/framework.html#translation-domain

Which Symfony component is used in the asset Twig function Symfony\Bridge\Twig\Extension\AssetExtension?

Answer:

  • Asset
  • Gulp
  • CssSelector
  • Assetic

http://symfony.com/doc/current/reference/twig_reference.html#asset

http://api.symfony.com/3.1/Symfony/Bridge/Twig/Extension/AssetExtension.html

What is the command to check the Symfony requirements?

Answer: bin/symfony_requirements

http://symfony.com/doc/current/deployment.html#a-check-requirements

What is the filename of the template to create a custom 404 error page?

Answer: app/Resources/TwigBundle/views/Exception/error404.html.twig

http://symfony.com/doc/current/cookbook/controller/error_pages.html

Is the following definition of route correct?

use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;

$collection->add('blog_show', new Route('/blog/{page}/category/{slug}/{page}', array(
  '_controller' => 'AppBundle:Blog:show',
)));

return $collection;

Answer: No - An exception is thrown : Route pattern "/blob/{page}/category/{slug}/{page}" cannot reference variable name "page" more than once.

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Routing/RouteCompiler.php#L128

What is the default status code of a Symfony\Component\HttpFoundation\RedirectResponse object?

Answer: 302

https://www.wikiwand.com/fr/Liste_des_codes_HTTP#/Redirection

What is the correct code to activate the tools to help you debug PHP code?

Answer:

use Symfony\Component\Debug\Debug;

Debug::enable();

http://symfony.com/doc/current/components/debug/introduction.html#usage

What is the purpose of the logging: true option in the translator config?

Answer: Log a message when Symfony doesn't find a translation for the given locale.

http://symfony.com/doc/current/reference/configuration/framework.html#logging

Is it possible to add a listener to several events?

Answer: Yes

http://symfony.com/doc/current/components/event_dispatcher/introduction.html#connecting-listeners

What is the way to destroy a variable in a PHP session?

Answer:

  • unset() on the variable in $_SESSION
  • session_destroy()
  • session_unset()
  • unset() on the variable in $HTTP_SESSION_VARS

http://php.net/manual/en/function.unset.php

http://php.net/manual/en/function.session-destroy.php

http://php.net/manual/en/function.session-unset.php

http://php.net/manual/en/reserved.variables.session.php

How you validate an object but only against a subset of the constraints ?

Answer: Using validation groups.

http://symfony.com/doc/current/validation/groups.html

Which attributes are reserved special routing parameters?

Answer:

  • _locale
  • _type
  • _response
  • _format
  • _controller

http://symfony.com/doc/current/routing.html#routing-format-param

When using HTTP basic, how does the server starts the authentication process?

Answer: Sending the WWW-Authenticate HTTP header with the HTTP 401 Not Authorized status code.

What will be the output of the following code?

<?php
function foo($y)
{
    return function($x) use ($y) {
        return str_repeat($y, $x);
    };
}
$a = foo(3);
$b = foo(2);
echo $a(2), $b(3);

Answer: 33222

http://php.net/manual/en/functions.anonymous.php

With the following code:

<?php
// ...
class Mailer
{
    // ...
    public function configureOptions(OptionsResolver $resolver)
    {
        // ...
        $resolver->setDefault('encryption', null);

        $resolver->setDefault('port', function () {
            if ('ssl' === $options['encryption']) {
                return 465;
            }

            return 25;
        });
    }
}

what would be the resolved $options passed as:

$options = array('encryption' => 'SSL');

Answer:

$options = array(
    'encryption' => 'SSL',
    'port' => function () {
            if ('ssl' === $options['encryption']) {
                return 465;
            }

            return 25;
        },
);

http://symfony.com/doc/current/components/options_resolver.html#default-values-that-depend-on-another-option

Magic __call() Method: What will be the result of the following code?

class Person
{
    private $children = array(
        'wouter' => 'Wouter',
    );

    public function __call($name, $args)
    {
        $property = lcfirst(substr($name, 3));
        if ('get' === substr($name, 0, 3)) {
            return isset($this->children[$property])
                ? $this->children[$property]
                : null;
        } elseif ('set' === substr($name, 0, 3)) {
            $value = 1 == count($args) ? $args[0] : null;
            $this->children[$property] = $value;
        }
    }
}

$person = new Person();

$accessor = $accessorBuilder->getPropertyAccessor();

$wouter = $accessor->getValue($person, 'wouter');

Answer:

  • The value of $wouter will be Wouter.
  • The value of $wouter will be null.
  • A Symfony\Component\PropertyAccess\Exception\NoSuchIndexException will be thrown.
  • A Symfony\Component\PropertyAccess\Exception\NoSuchPropertyException will be thrown.

http://symfony.com/doc/current/components/property_access/introduction.html#magic-call-method

Construct a route in PHP: When declaring a route in PHP, what is the 6th argument of the constructor of the Route class?

Answer: A required URI scheme or an array of restricted schemes.

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Routing/Route.php#L74-L81

Ignoring Attributes: What is the correct way to ignore attributes?

Answer: $normalizer->setIgnoredAttributes(array('age'));

http://symfony.com/doc/current/components/serializer.html#ignoring-attributes

Generate a 404 page: How can you generate a 404 response from a controller that extends from the base controller?

Answer:

  • return \Symfony\Component\HttpKernelInterface::NOT_FOUND;
  • throw new \Symfony\Component\HttpKernel\Exception\NotFoundHttpException('Not found', null);
  • throw $this->createNotFoundException('Not found');
  • $this->generateException(404, 'Not found');

http://symfony.com/doc/current/book/controller.html#managing-errors-and-404-pages

Service definition: With the following service definition how is it possible to access the mailer service?

services:
    app.mailer.one:
        class: AppBundle\OneMailer
        arguments: [sendmail]
        public: false

    app.mailer
        alias: app.mailer.one

Answer:

$container->get('app.mailer');

http://symfony.com/doc/current/components/dependency_injection/advanced.html#aliasing

Twig block: Which of these are valid block?

Answer:

  • {% block content 'content' block %}
  • {% block content 'content' %}
  • {% startblock content %} content {% finishblock content %}
  • {% startblock content %} content {% endblock content %}
  • {% block content %} content {% endblock %}
  • {% block content %} content {% endblock content %}
  • {% block content %} content {% finishblock content %}

http://twig.sensiolabs.org/doc/functions/block.html

PHP birth: In which year was born PHP?

Answer: 1995

http://php.net/manual/en/history.php.php

PropertyAccess Component - 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]');

Answer:

  • 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.
  • The value of $age will be null.

http://symfony.com/doc/current/components/property_access/introduction.html#reading-from-arrays

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/PropertyAccess/PropertyAccessorBuilder.php#L70-L83

Validator Component - Validation constraints: Which of the following elements can contain validation constraints?

Answer:

  • Private and protected properties
  • Public getters/issers
  • Public properties
  • Classes
  • Private and protected getters/issers

http://symfony.com/doc/current/reference/constraints.html

Functions arguments: What are the ways to get the third argument passed to a function?

Answer:

  • func_get_args()
  • func_get_arg(3)
  • $argv[2]
  • $argv[3]
  • func_get_arg(2)

http://php.net/manual/en/function.func-get-arg.php

http://php.net/manual/en/function.func-get-args.php

Loading type: Which type of loader is not supported by Symfony?

Answer:

  • Closure
  • PHP
  • INI
  • YML

https://github.com/symfony/symfony/tree/3.0/src/Symfony/Component/Routing/Loader

HTTP Cache: Which of these HTTP headers tell a reverse proxy cache like Varnish to cache the response it receives during 90 minutes or more?

Answer:

  • Cache-Control: public, s-maxage=90
  • Cache-Control: public
  • Cache-Control: private, maxage=324000
  • Cache-Control: public, s-maxage=324000
  • Cache-Control: private, maxage=90

https://tools.ietf.org/html/rfc2616

http://stackoverflow.com/questions/3492319/private-vs-public-in-cache-control#answer-3492459

http://stackoverflow.com/questions/15971747/does-it-make-sense-to-have-max-age-and-s-maxage-in-the-cache-control-http-header#answer-15972973

Construct a route in PHP: When declaring a route in PHP, what is the 7th argument of the constructor of the Route class?

Answer: The required HTTP methods.

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Routing/Route.php#L74-L81

PHP Configuration: How can you get the value of the current configuration directives (php.ini) of a PHP extension?

Answer:

  • With the reflection API
  • With ini_get_all()
  • With get_loaded_extensions()
  • With php://config stream
  • With the $GLOBALS array

http://php.net/manual/en/function.ini-get-all.php

http://php.net/manual/en/reflectionextension.getinientries.php

http://php.net/manual/en/function.get-loaded-extensions.php

Twig Strict Variables Mode: Consider the following Twig code snippet:

The {{ color }} car!

What will be the result of evaluating this template when passing it the blue for the color variable value and when the strict_variables global setting is on?

Answer: The template will be succesfully evaluated and the string The blue car! will be displayed in the web browser.

https://github.com/twigphp/Twig/blob/1.x/lib/Twig/Environment.php#L78

Twig internals: Which of the following Twig internal objects is responsible for transforming an AST (Abstract Syntax Tree) into PHP code?

  • The Environment
  • The Lexer
  • The Compiler
  • The Parser

http://twig.sensiolabs.org/doc/internals.html

Functional Test: What is the class to extends in a Symfony functional test class?

  • Symfony\Bundle\FrameworkBundle\Test\WebTestCase
  • Symfony\Bundle\FrameworkBundle\Test\Functional\WebTestCase
  • Symfony\Component\Test\FunctionalTestCase
  • Symfony\Component\Test\WebTestCase
  • Symfony\Bundle\FrameworkBundle\Test\FunctionalTestCase

http://symfony.com/doc/current/book/testing.html#your-first-functional-test

Première journée de formation : Security Component + Event Listeners

Security Component

Version minimum a étudier : > 2.6

Le Security Component est stand alone.

Avec Symfony, on utilise ce composant par le biai du bridge