/**
  * Returns cache
  *
  * @return AppCache The update cache
  * @since 2.0
  */
 protected function getCache()
 {
     if (empty($this->_cache)) {
         $this->_cache = $this->app->cache->create($this->app->path->path('cache:') . '/zoo_update_cache');
         if (!$this->_cache->check()) {
             $this->app->system->application->enqueueMessage('Cache not writeable please update the file permissions!', 'warning');
         }
     }
     return $this->_cache;
 }

<?php

use Symfony\Component\ClassLoader\ApcClassLoader;
use Symfony\Component\HttpFoundation\Request;
$loader = (require_once __DIR__ . '/../app/bootstrap.php.cache');
// Use APC for autoloading to improve performance.
// Change 'sf2' to a unique prefix in order to prevent cache key conflicts
// with other applications also using APC.
$apcLoader = new ApcClassLoader('sf2', $loader);
$loader->unregister();
$apcLoader->register(true);
require_once __DIR__ . '/../app/AppKernel.php';
require_once __DIR__ . '/../app/AppCache.php';
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
$kernel = new AppCache($kernel);
// When using the HttpCache, you need to call the method in your front controller instead of relying on the configuration parameter
Request::enableHttpMethodParameterOverride();
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);

<?php

require_once __DIR__ . '/../app/bootstrap.php.cache';
require_once __DIR__ . '/../app/AppKernel.php';
require_once __DIR__ . '/../app/AppCache.php';
use Symfony\Component\HttpFoundation\Request;
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
$kernel = new AppCache($kernel);
$kernel->handle(Request::createFromGlobals())->send();

<?php

use Symfony\Component\ClassLoader\ApcClassLoader;
use Symfony\Component\HttpFoundation\Request;
$loader = (require_once __DIR__ . '/../app/bootstrap.php.cache');
// Use APC for autoloading to improve performance.
// Change 'sf2' to a unique prefix in order to prevent cache key conflicts
// with other applications also using APC.
/*
$loader = new ApcClassLoader('sf2', $loader);
$loader->register(true);
*/
require_once __DIR__ . '/../app/AppKernel.php';
require_once __DIR__ . '/../app/AppCache.php';
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
$kernel = new AppCache($kernel);
error_log($kernel->getLog());
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);

<?php

use Symfony\Component\HttpFoundation\Request;
// If you don't want to setup permissions the proper way, just uncomment the following PHP line
// read http://symfony.com/doc/current/book/installation.html#configuration-and-setup for more information
//umask(0000);
// This check prevents access to debug front controllers that are deployed by accident to production servers.
// Feel free to remove this, extend it, or make something more sophisticated.
if (isset($_SERVER['HTTP_CLIENT_IP']) || isset($_SERVER['HTTP_X_FORWARDED_FOR']) || !in_array(@$_SERVER['REMOTE_ADDR'], array('127.0.0.1', '::1'))) {
    header('HTTP/1.0 403 Forbidden');
    exit('You are not allowed to access this file. Check ' . basename(__FILE__) . ' for more information.');
}
$loader = (require_once __DIR__ . '/../app/bootstrap.php.cache');
require_once __DIR__ . '/../app/AppKernel.php';
require_once __DIR__ . '/../app/AppCache.php';
$kernel = new AppKernel('dev', true);
$kernel->loadClassCache();
//
$kernel = new AppCache($kernel);
$kernel->handle(Request::createFromGlobals())->send();
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);

 public function clearCache()
 {
     if ($this->_cache) {
         $this->_cache->clear()->save();
     }
 }