yii\mongodb\rbac\MongoDbManager::checkAccess PHP Method

    public function checkAccess($userId, $permissionName, $params = [])
    {
        $assignments = $this->getAssignments($userId);
        $this->loadFromCache();
        if ($this->items !== null) {
            return $this->checkAccessFromCache($userId, $permissionName, $params, $assignments);
        } else {
            return $this->checkAccessRecursive($userId, $permissionName, $params, $assignments);
        }
    }