My Symfony project web/app.php file

app.php

<?php

require_once __DIR__.'/../app/bootstrap.php.cache';
require_once __DIR__.'/../app/AppKernel.php';

use Symfony\Component\HttpFoundation\Request;

$mode = (getenv('APPLICATION_ENV')) ? getenv('APPLICATION_ENV') : 'dev';

umask(0000);

$kernel = new AppKernel($mode, false);
$kernel->loadClassCache();

if($mode == 'prod')
{
  require_once __DIR__.'/../app/AppCache.php';
  $kernel = new AppCache($kernel);
}
$kernel->handle(Request::createFromGlobals())->send();