/**
* 搜索帖子
*
* @param object $so
* @return array
*/
public function searchThread(PwThreadSo $so, $limit = 20, $offset = 0, $fetchmode = self::FETCH_MAIN)
{
return $this->_getThreadMergeDao()->searchThread($fetchmode, $so->getData(), $so->getOrderby(), $limit, $offset);
}