How can routing be implemented in PHP applications to avoid the need for including scripts based on $_SERVER['PHP_SELF']?

When implementing routing in PHP applications, you can avoid the need for including scripts based on $_SERVER['PHP_SELF'] by using a routing library or framework such as Symfony Routing Component or Laravel Routing. These libraries allow you to define routes and map them to specific controller actions, eliminating the need to include scripts based on $_SERVER['PHP_SELF'].

// Example using Symfony Routing Component
require 'vendor/autoload.php';

use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\Matcher\UrlMatcher;

$routes = new RouteCollection();
$routes->add('home', new Route('/', ['controller' => 'HomeController', 'action' => 'index']));
$routes->add('about', new Route('/about', ['controller' => 'AboutController', 'action' => 'index']));

$context = new RequestContext('/');
$matcher = new UrlMatcher($routes, $context);

$pathInfo = $_SERVER['PATH_INFO'] ?? '/';
$parameters = $matcher->match($pathInfo);

$controller = $parameters['controller'];
$action = $parameters['action'];

// Instantiate and call the controller action
$controllerInstance = new $controller();
$controllerInstance->$action();