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Working with Sessions

If you need sessions, please use the native session handling provided by Symfony (configured through the framework.session config). For details see sessions docs.

In case you need to add a custom session bag for your bundle or application, then implement an EventListener to register the session bag before the session started.

Register a Session Bag through EventListener

namespace TestBundle\EventListener;
use Pimcore\Session\SessionConfiguratorInterface;
use Symfony\Component\HttpFoundation\Session\Attribute\AttributeBag;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
class SessionBagListener implements EventSubscriberInterface
    public static function getSubscribedEvents(): array
        return [
            //run after Symfony\Component\HttpKernel\EventListener\SessionListener
            KernelEvents::REQUEST => ['onKernelRequest', 127],
     * @param RequestEvent $event
    public function onKernelRequest(RequestEvent $event)
        if (!$event->isMainRequest()) {

        $session = $event->getRequest()->getSession();
        $bag = new AttributeBag('_session_cart');

Usage of Configured Session, e.g. in Controller

if ($request->hasSession()) {
    $session = $request->getSession();
    /** @var AttributeBag $bag */
    $bag = $session->getBag('session_cart');
    $bag->set('foo', 1);

Symfony framework session is configured by default, so you don't need to configure the session in your config.yaml.

Admin sessions Pimcore\Tool\Session::getReadonly() returns an AttributeBagInterface.