How do you customize a PHP framework's routing system?

2 Choosing a Framework

The next step is to choose a PHP framework that suits your needs and preferences. There are many options available, such as Laravel, Symfony, and CodeIgniter. Each has its own advantages and disadvantages, features and limitations, and conventions and configurations. For example, Laravel is a modern and elegant framework that provides a rich set of features and tools, such as authentication, validation, caching, testing, and more. It uses a simple and expressive syntax for defining routes. On the other hand, Symfony is a powerful and flexible framework that follows the MVC (Model-View-Controller) pattern and adheres to the PSR (PHP Standards Recommendations) standards. It uses a YAML or XML file for defining routes. Finally, CodeIgniter is a lightweight and fast framework that follows the HMVC (Hierarchical Model-View-Controller) pattern and uses a simple and consistent structure. It uses a PHP file for defining routes.

3 Modifying the Routing Files

The final step is to modify the routing files of your chosen framework to customize the routing system according to your web application's logic and functionality. The routing files are usually located in the app or config folder of your framework, and have different extensions depending on the framework. For example, Laravel uses .php files, Symfony uses .yaml or .xml files, and CodeIgniter uses .php files. To modify the routing files, you need to follow the syntax and rules of your framework, and use the available options and parameters to define and configure your routes. For example, in Laravel, you can use the Route facade to define a route that maps the URL /posts/{id} to the show method of the PostController class, and applies the auth middleware to check if the user is logged in: Route::get('/posts/{id}', [PostController::class, 'show'])->middleware('auth'); In Symfony, you can use the YAML file to define a route that maps the URL /posts/{id} to the show method of the PostController class, and specifies that the id parameter must be a number:

post_show:
  path: /posts/{id}
  controller: App\Controller\PostController::show
  requirements:
    id: '\d+'        

In CodeIgniter, you can use the PHP file to define a route that maps the URL /posts/{id} to the show method of the Post controller class, and uses a regular expression to match the id parameter: $route['posts/(:num)'] = 'post/show/$1';