How to get the id of the current user in symfony?

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use SymfonyComponentSecurityCoreSecurity;

class YourController extends AbstractController
{
    private $security;

    public function __construct(Security $security)
    {
        $this->security = $security;
    }

    public function getCurrentUserId()
    {
        $user = $this->security->getUser();

        if ($user) {
            $userId = $user->getId();
            return $userId;
        }

        return null; // No user is currently logged in
    }
}