Symfony Routing Compony example

<?php
/**
 * @author Tomasz Marcinkowski
 * @since 31 10 2013
 */

$path_base = '/symfony-components';

spl_autoload_register(function ($class) {
  $pcr0_class_to_path = str_replace('\\', '/', $class);
  require __DIR__ . '/' . $pcr0_class_to_path . '.php';
});

ini_set('display_errors', 1);
error_reporting(E_ALL);

use Symfony\Component\Routing\Generator\UrlGenerator;
use Symfony\Component\Routing\Matcher\UrlMatcher;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;

$routes = new RouteCollection();
$routes->addPrefix($path_base);
$routes->setHost('{subdomain}{_dot}szoper.net');
$routes->addRequirements(array(
  'subdomain'  => '[a-z-]*',
  '_dot'=>'\.?',
));
$routes->addDefaults(array('slash' => '/'));

$routes->add('homepage', new Route('{slash}', array('controller' => 'HomepageController'), array(
  'slash' => '/*',
)));
$routes->add('products', new Route(
  '/product/{product_id}',
  array('controller' => 'ProductController'),
  array(
    'product_id' => '[0-9]*',
  )
));
$routes->add('posts', new Route(
  '/post/{post_id}',
  array('controller' => 'PostController'),
  array(
    'post_id' => '[0-9]*',
    'subdomain'  => '[a-z-]*',
    '_dot'=>'\.?',
  ),
  array(),
  '{subdomain}{_dot}szoper.net'
));

$context = new RequestContext('', $_SERVER['REQUEST_METHOD'], $_SERVER['HTTP_HOST']);
$matcher = new UrlMatcher($routes, $context);
$generator = new UrlGenerator($routes, $context);

$path_info = preg_replace('!^' . $path_base . '!', '', $_SERVER['REQUEST_URI']);

try {
  $parameters = $matcher->match($path_info);
  var_dump($parameters);
} catch (\Symfony\Component\Routing\Exception\ResourceNotFoundException $e) {
  printf('oops! no controller found for: %s', $path_info);
}


$link = $generator->generate('products', array('product_id' => rand(1,999)), true);
echo sprintf('<br>Random product link: <a href="%s">%s</a>', $link, $link);