Horde_Imap_Client_Base::_getSearchCache PHP Method

    protected function _getSearchCache($type, $options)
    {
        $status = $this->status($this->_selected, Horde_Imap_Client::STATUS_HIGHESTMODSEQ | Horde_Imap_Client::STATUS_UIDVALIDITY);
        /* Search caching requires MODSEQ, which may not be active for a
         * mailbox. */
        if (empty($status['highestmodseq'])) {
            return null;
        }
        ksort($options);
        $cache = hash('md5', $type . serialize($options));
        $cacheid = $this->getSyncToken($this->_selected);
        $ret = array();
        $md = $this->_cache->getMetaData($this->_selected, $status['uidvalidity'], array(self::CACHE_SEARCH, self::CACHE_SEARCHID));
        if (!isset($md[self::CACHE_SEARCHID]) || $md[self::CACHE_SEARCHID] != $cacheid) {
            $md[self::CACHE_SEARCH] = array();
            $md[self::CACHE_SEARCHID] = $cacheid;
            if ($this->_debug->debug && !isset($this->_temp['searchcacheexpire'][strval($this->_selected)])) {
                $this->_debug->info(sprintf('SEARCH: Expired from cache [%s]', $this->_selected));
                $this->_temp['searchcacheexpire'][strval($this->_selected)] = true;
            }
        } elseif (isset($md[self::CACHE_SEARCH][$cache])) {
            $this->_debug->info(sprintf('SEARCH: Retrieved %s from cache (%s [%s])', $type, $cache, $this->_selected));
            $ret['data'] = $md[self::CACHE_SEARCH][$cache];
            unset($md[self::CACHE_SEARCHID]);
        }
        return array_merge($ret, array('id' => $cache, 'metadata' => $md, 'type' => $type));
    }

 /**
  */
 protected function _getSearchCache($type, $mailbox, $options)
 {
     /* Search caching requires MODSEQ, which may not be active for a
      * mailbox. */
     return empty($this->_temp['mailbox']['highestmodseq']) ? null : parent::_getSearchCache($type, $mailbox, $options);
 }