$this->database()->select('COUNT(DISTINCT u.user_id)')->join(Phpfox::getT('log_session'), 'ls', 'ls.user_id = u.user_id' . (!defined('PHPFOX_IS_ADMIN_SEARCH') ? ' AND ls.im_hide = 0' : '') . ' AND ls.last_activity >= ' . (PHPFOX_TIME - (Phpfox::getParam('log.active_session')*60)));