OR (`item`.`attach` != '') OR `item`.`wall` OR `item`.`origin`)
AND `item`.`parent` = `thread`.`iid`)
ORDER BY `thread`.`iid` LIMIT 1000", $days, $last_id);
OR (`item`.`attach` != '') OR `item`.`wall` OR `item`.`origin`)
AND `item`.`parent` = `thread`.`iid`)
ORDER BY `thread`.`iid` LIMIT 1000", $days, $last_id);