PHP built-in web server's routing settings for Symfony2

router.php

<?php
/**
 * This script set in your project's web/ directory.
 * Then, you boot built-in web server as below.
 *
 * php -S 0.0.0.0:50000 -t /path/to/web/ /path/to/web/router.php
 */
if (preg_match('/^(app|app_dev|config)\.php|\.(js|css|html|gif|png|jpg)$/', $_SERVER['REQUEST_URI'])) {
    return false;
} else {
    require 'app_dev.php';
}