59     protected $_cache = null;  variable in auth_plugin_authphpbb3
105         $this->_cache = null;
148             $result = unserialize($this->_cache->retrieveCache(false));
517             $this->_phpbb_conf = unserialize($this->_cache->retrieveCache(false));
519             $this->_cache->removeCache();
548             $this->_cache->storeCache(serialize($this->_phpbb_conf));
560         if ($this->_cache === null) {
561             $this->_cache = new cache('authphpbb3', $this->_cache_ext_name);
563         return $this->_cache;
581         return $this->_cache->useCache($depends);
669             $result = unserialize($this->_cache->retrieveCache(false));