User cache Symfony2

gistfile1.txt

In config.yml:

    services:
        cache:
            class: Doctrine\Common\Cache\ApcCache

In code:

    if ($this->get('cache')->contains('menu')) {
        $menu = unserialize($this->get('cache')->fetch('menu'));
    } else {
        $menu = /* IMPLEMENTATION_NEEDED */
        $this->get('cache')->save('menu', serialize($menu));
    }