framework/rbac/DbManager.php
public function checkAccess($userId, $permissionName, $params = [])
    {
        if (isset($this->_checkAccessAssignments[(string) $userId])) {
            $assignments = $this->_checkAccessAssignments[(string) $userId];
        } else {
            $assignments = $this->getAssignments($userId);
            $this->_checkAccessAssignments[(string) $userId] = $assignments;
        }

        if ($this->hasNoAssignments($assignments)) {
            return false;
        }

        $this->loadFromCache();
        if ($this->items !== null) {
            return $this->checkAccessFromCache($userId, $permissionName, $params, $assignments);
        }

        return $this->checkAccessRecursive($userId, $permissionName, $params, $assignments);
    }
public function checkAccess($userId, $permissionName, $params = [])
    {
        if (isset($this->_checkAccessAssignments[(string) $userId])) {
            $assignments = $this->_checkAccessAssignments[(string) $userId];
        } else {
            $assignments = $this->getAssignments($userId);
            $this->_checkAccessAssignments[(string) $userId] = $assignments;
        }

        if ($this->hasNoAssignments($assignments)) {
            return false;
        }

        $this->loadFromCache();
        if ($this->items !== null) {
            return $this->checkAccessFromCache($userId, $permissionName, $params, $assignments);
        }

        return $this->checkAccessRecursive($userId, $permissionName, $params, $assignments);
    }
{@inheritdoc}