How to implement custom error pages in Symfony?

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

1. Create custom error templates:

   • Create a directory named error inside your templates directory.
   • Inside the error directory, create templates for the error pages you want to customize. For example, you can create error.html.twig for the general error page, 404.html.twig for the 404 Not Found error page, 403.html.twig for the 403 Forbidden error page, etc. You can customize these templates with the content and style you want for each error page.

2. Configure the error controller:

   • In your Symfony project, open the src/Controller directory and create a new controller class (e.g., ErrorController.php).
   • In the ErrorController class, create methods for handling different types of errors. For example, you can create a showError method for the general error page, a showNotFound method for the 404 error page, a showForbidden method for the 403 error page, etc.
   • Inside each method, render the corresponding custom error template using Twig. For example, you can use the $this->render() method to render the error.html.twig, 404.html.twig, or 403.html.twig templates.

3. Configure the routing:

   • Open the config/routes.yaml file in your Symfony project.
   • Add routes for each custom error page that point to the corresponding methods in the ErrorController class. For example:
   errors: path: /error controller: App\Controller\ErrorController::showError not_found: path: /not-found controller: App\Controller\ErrorController::showNotFound forbidden: path: /forbidden controller: App\Controller\ErrorController::showForbidden

4. Configure the error handling:

   • In the config/packages/twig.yaml file, enable the exception_controller option and set it to the routing path of the error controller, for example:
   twig: exception_controller: 'App\Controller\ErrorController::showError'

5. Test the custom error pages:

   • To test the custom error pages, intentionally trigger different types of errors in your Symfony application (e.g., accessing a non-existent route, trying to access a restricted page, etc.).
   • You should see the custom error pages that you have created for each type of error instead of the default Symfony error pages.

By following these steps, you can implement custom error pages in Symfony and customize the error pages according to your needs and preferences.