index.php

<?php
require_once(__DIR__.'/../vendor/autoload.php'); 
$included = get_included_files();
$app = new Silex\Application(); 
$app->get('/', function() use($app, $included) { 
    $difference = array_diff(get_included_files(), $included);
    $difference = array_values($difference);
    return 'Hello World. <br /><pre>'.print_r($difference, true).'</pre>';
}); 
$app->run();