Our new front controller using HTTP Foundation - http://www.symfonycentral.com

front.php

<?php 
// ...

$request = Request::createFromGlobals();

$routes->add('leap_year', new Routing\Route('/is_leap_year/{year}', array(
    'year' => null,
    '_controller' => 'LeapYearController::indexAction',
)));
 
$context = new Routing\RequestContext();
$context->fromRequest($request);
$matcher = new Routing\Matcher\UrlMatcher($routes, $context);
$resolver = new HttpKernel\Controller\ControllerResolver();
 
try {
    $request->attributes->add($matcher->match($request->getPathInfo()));
 
    $controller = $resolver->getController($request);
    $arguments = $resolver->getArguments($request, $controller);
 
    $response = call_user_func_array($controller, $arguments);
} // ...