How to customize error pages in Symfony?

@gilbert 

To customize error pages in Symfony, you can follow these steps:

1. Create a new template file for the error page. By default, Symfony uses the exception.html.twig template for error pages. You can override this template by creating a new template file in your project's templates/bundles/TwigBundle/Exception directory, named according to the HTTP error code you want to customize (e.g. error404.html.twig for a 404 error).
2. Customize the content of the template file. You can use all of Twig's features to customize the appearance of the error page, including variables provided by Symfony such as the exception message and stack trace.
3. Configure Symfony to use your custom error template. You can do this by adding the following configuration to your config/packages/twig.yaml file:twig: exception_controller: 'AppControllerExceptionController::showException'
4. Create a new controller class to handle exceptions. This controller should extend Symfony's built-in AbstractController class and define a showException method that renders the appropriate error template based on the HTTP error code. For example:<?php namespace AppController; use SymfonyBundleFrameworkBundleControllerAbstractController; use SymfonyComponentHttpFoundationResponse; use SymfonyComponentHttpKernelExceptionHttpExceptionInterface; class ExceptionController extends AbstractController { public function showException(HttpExceptionInterface $exception): Response { $statusCode = $exception->getStatusCode(); return $this->render("@Twig/Exception/error$statusCode.html.twig", [ 'status_code' => $statusCode, 'status_text' => Response::$statusTexts[$statusCode], 'exception' => $exception, ]); } }
5. Clear the Symfony cache to ensure that your changes are picked up:php bin/console cache:clear

With these steps, you should now be able to customize error pages in Symfony according to your needs.