use Symfony\Component\HttpFoundation\Request;use Symfony\Component\Routing\RouteCollection;use Symfony\Component\Routing\Route;use Symfony\Component\Routing\RequestContext;use Symfony\Component\Routing\Generator\UrlGenerator;// routes$routes = new RouteCollection();$routes->add('page', new Route('/blog/{slug}'));$routes->add('blog', new Route('/blog/'));// current context$request = Request::create('http://example.org/blog/what-a-wonderful-world/comments');$context = new RequestContext();$context->fromRequest($request);// create a generator$generator = new UrlGenerator($routes, $context);// generate a relative-path URL (will output ./)echo $generator->generate('blog', array(), UrlGeneratorInterface::RELATIVE_PATH);