1、 根据文章中uid组成$uids
2、 根据$uids查询相关用户的信息(select * from pw_members where uid in ($uids))
3、 根据$uids查询相关用户的$gids (select * form pw_permission where uid in ($uids))
4、 根据$gids查询相关用户组信息(select * form pw_usergroups where gid in ($gids))
5、 最后遍历下文章信息,将用户信息和用户组信息追加到文章信息中
select x.*, u.name, ug.等级name from pw_xinjia as x
left join pw_members as m on x.uid = m.uid
left join pw_permission as p on p.uid = x.uid
left join pw_usergroups as ug on ug.gid = p.gid
where x.条件