20     var $_auth = null;  variable in admin_plugin_groupadmin
38             $this->_auth = & $auth;
58         if (!is_null($this->_auth))
75         if (is_null($this->_auth)) return false;
98         $all_users = $this->_auth->retrieveUsers();
99         if ($this->_auth->canDo("getGroups")) {
100             $group_list = $this->_auth->retrieveGroups();
136             $users_in_group = $this->_auth->retrieveUsers(0, -1, $filter);
197         $oldusersinfo = $this->_auth->retrieveUsers(0, -1, $group_filter);
198         $oldusers = array_keys($this->_auth->retrieveUsers(0, -1, $group_filter));
215                 $newuserinfo = $this->_auth->getUserData($newuser);
226         $this->_auth->triggerUserMod('modify', array($username, $changes));