在用户接受条款之前，Symfony 2不会创建任何cookie

I am trying to implement a way to stop Symfony 2 creating a cookie. When a user logs onto the clients site a popup will appear which will allow the user to accept the cookie policy. Only after this has been accepted should cookies be created. How do I stop symfony creating cookies until this has happened?

I think the best way is to check user upon login.

One option is to have kernel.event_listener

It should be something like this

use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;

/**
 * This listener ensure that logged user must accept latest terms of service
 *
 * @author po_taka
 */
class TermsForceListener
{
    private $tokenStorage;

    public function __construct(TokenStorageInterface $tokenStorage)
    {
        $this->tokenStorage = $tokenStorage;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        if (!$event->isMasterRequest()) {
            return;
        }

        $user = $this->tokenStorage->getToken()->getUser();

        if (!$user instanceof YOUR_CLASS_HERE) {
            return;
        }

        if ($user->getTermsAccepted()) {
            // terms are accepted, continue with the page loading
            return;
        }

        if (YOUR_VALIDATION_IF_CURRENT_PAGE_IS_TERMS_ACEEPTING_PAGE) {
            $response = new \Symfony\Component\HttpFoundation\RedirectResponse(TERMS_ACCEPTING_PAGE, 302);
            $event->setResponse($response);
            $event->stopPropagation();
        }
    }
}

You can register it using the following yaml

YOUR_SEVICE_NAME_HERE:
    class: TermsForceListener
    arguments: ['@security.token_storage']
    tags:
        - { name: kernel.event_listener, event: kernel.request }

You can read more about symfony events here - https://symfony.com/doc/current/reference/events.html