$countQuery = preg_replace("/select[ \r\n\t](.*)[ \r\n\t]from/i","Select count(*) as dd From",$this->sourceSql);

修改為：

$countQuery = preg_replace("#SELECT[ \r\n\t](.*)[ \r\n\t]FROM#is", 'SELECT COUNT(*) AS dd FROM', $this->sourceSql);

$countQuery = preg_replace("#ORDER[ \r\n\t]{1,}BY(.*)#is", '', $countQuery);