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How does routing with a PHP router library like FastRoute simplify URL handling compared to mod-rewrite rules in PHP applications?

Routing with a PHP router library like FastRoute simplifies URL handling in PHP applications by allowing developers to define routes in a more structured and readable way compared to using mod-rewrite rules. With FastRoute, developers can easily map URLs to specific controller actions without the need for complex regular expressions or configuration files.

php 
require 'vendor/autoload.php';

use FastRoute\RouteCollector;

$dispatcher = FastRoute\simpleDispatcher(function(RouteCollector $r) {
    $r->addRoute('GET', '/user/{id:\d+}', 'UserController@show');
    $r->addRoute('POST', '/user', 'UserController@store');
});

$httpMethod = $_SERVER['REQUEST_METHOD'];
$uri = $_SERVER['REQUEST_URI'];

$routeInfo = $dispatcher->dispatch($httpMethod, $uri);

switch ($routeInfo[0]) {
    case FastRoute\Dispatcher::NOT_FOUND:
        echo '404 Not Found';
        break;
    case FastRoute\Dispatcher::METHOD_NOT_ALLOWED:
        echo '405 Method Not Allowed';
        break;
    case FastRoute\Dispatcher::FOUND:
        $handler = $routeInfo[1];
        $vars = $routeInfo[2];
        // Call controller method based on $handler
        break;
}

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