JAccess/getAuthorisedViewLevels

static JAccess::getAuthorisedViewLevels($userId)

jimport( 'joomla.access.access' );

        public static function getAuthorisedViewLevels($userId)
        {
                // Get all groups that the user is mapped to recursively.
                $groups = self::getGroupsByUser($userId);
 
                // Only load the view levels once.
                if (empty(self::$viewLevels))
                {
                        // Get a database object.
                        $db     = JFactory::getDBO();
 
                        // Build the base query.
                        $query  = new JQuery;
                        $query->select('id, rules');
                        $query->from('`#__viewlevels`');
 
                        // Set the query for execution.
                        $db->setQuery((string) $query);
 
                        // Build the view levels array.
                        foreach ($db->loadAssocList() as $level)
                        {
                                self::$viewLevels[$level['id']] = (array) json_decode($level['rules']);
                        }
                }
 
                // Initialize the authorised array.
                $authorised = array(1);
 
                // Find the authorized levels.
                foreach (self::$viewLevels as $level => $rule)
                {
                        foreach ($rule as $id)
                        {
                                if (($id < 0) && (($id * -1) == $userId))
                                {
                                        $authorised[] = $level;
                                        break;
                                }
                                // Check to see if the group is mapped to the level.
                                elseif (($id >= 0) && in_array($id, $groups))
                                {
                                        $authorised[] = $level;
                                        break;
                                }
                        }
                }
 
                return $authorised;
        }