A Router in a Tweet

Router.php

<?php

/**
 * The Router class is a fast and lightweight router (yes it is). It can handle
 * a path and call the matching controller. If there is no match, then an
 * exception will be throwned.
 *
 * ...and it fits in a tweet.
 *
 * @author Quentin Schuler aka Sukei <qschuler@neosyne.com>
 */
class Router{private $r;function add($r,$c){$this->r[$r]=$c;}function match($r){$r=@$this->r[$r]?:function(){throw new Exception;};$r();}}

<?php

$router = new Router();

$router->add('/hello', function() {
    echo 'Hello sukei!';
});

try {
    $router->match($_SERVER['PATH_INFO']);
} catch (Exception $e) {
    http_response_code(404);
}