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Symfony Interview Questions

Symfony is a powerful PHP framework for building robust, scalable, and high-performance web applications. It emphasizes reusable components, clean architecture, and long-term stability.

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A Symfony controller is a PHP function that responds to user requests. It is responsible for fetching data from the model and passing it to the view.

Follow these steps to create a controller:

  1. Create a new PHP class in the src/Controller directory.
  2. Use the Symfony\Bundle\FrameworkBundle\Controller\AbstractController as your base class.
  3. Define a method in the class that will handle the request.

Here’s a simple example:

namespace App\Controller;\nuse Symfony\Component\HttpFoundation\Response;\nclass DefaultController extends AbstractController {\n    public function index() {\n        return new Response('Hello, Symfony!');\n    }\n}
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Symfony services are objects that perform specific tasks and can be reused throughout your application. They are defined in the service container.

To define a service:

  1. Create a PHP class that represents the service.
  2. Configure the service in config/services.yaml.
  3. Inject dependencies as needed through the service's constructor.

Example service definition:

services:\n    App\Service\MyService:\n        arguments: ['@another_service']
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A Symfony form is a way to handle user input in a structured manner. It allows you to create and manage forms easily, including validation and error handling.

To handle form submissions:

  1. Create a form type class that defines the fields.
  2. In your controller, create a form instance with the data you want to populate.
  3. Handle the request and check if the form is submitted and valid.

Example of handling a form:

$form = $this->createForm(MyFormType::class, $myEntity);\n$form->handleRequest($request);\nif ($form->isSubmitted() && $form->isValid()) {\n    // Process the data\n}
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Symfony's security system provides tools for authentication and authorization in your application. It is highly configurable and integrates seamlessly with various authentication providers.

To use Symfony security:

  1. Configure the security settings in config/packages/security.yaml.
  2. Define user roles and access control for different routes.
  3. Create a login form or use a firewall for authentication.

Example of a security configuration:

security:\n    firewalls:\n        main:\n            anonymous: true\n            form_login:\n                login_path: login\n                check_path: login_check
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