class Controller {
 public function demo()
 {
   echo 'Hello world';
 }
}

<?php

require_once __DIR__.'/vendor/autoload.php';

use FastRouteRouteCollector;
use FastRoutesimpleDispatcher;
use FastRouteDispatcher;

$dispatcher = FastRoutesimpleDispatcher(function(FastRouteRouteCollector $r){
    // test route
    $r->addRoute('GET', '/', 'Controller@demo');
});

// Fetch method and URI from somewhere
$httpMethod = $_SERVER['REQUEST_METHOD'];
$uri = $_SERVER['REQUEST_URI'];

// Strip query string (?foo=bar) and decode URI
if (false !== $pos = strpos($uri, '?')) {
    $uri = substr($uri, 0, $pos);
}
$uri = rawurldecode($uri);

$routeInfo = $dispatcher->dispatch($httpMethod, $uri);
switch ($routeInfo[0]) {
    case FastRouteDispatcher::NOT_FOUND:
        // ... 404 Not Found
        break;
    case FastRouteDispatcher::METHOD_NOT_ALLOWED:
        $allowedMethods = $routeInfo[1];
        // ... 405 Method Not Allowed
        break;
    case FastRouteDispatcher::FOUND:
        $handler = $routeInfo[1];
        $vars = $routeInfo[2];
        list($class, $method) = explode("@", $handler, 2);
        call_user_func_array([$class, $method], $vars);
        break;
}

?>