Backend\Modules\Groups\Engine\Model::isUserInGroup PHP Méthode

    public static function isUserInGroup($userId, $groupId)
    {
        $groupsByUser = static::getGroupsByUser($userId);
        $userInGroup = false;
        foreach ($groupsByUser as $group) {
            if ((int) $group['id'] === (int) $groupId) {
                $userInGroup = true;
                break;
            }
        }
        return $userInGroup;
    }