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query("UPDATE $UserDB.unz_users SET pcount = pcount + 1 WHERE uid = '$uid'") or die_query(1);
query("UPDATE $forumzDB.forumz_threads SET replies = replies + 1, lp_time = '$time' WHERE tid = '$tid'") or die_query(3);//add one to the replies
query("UPDATE $forumzDB.forumz_forums SET postCount = postCount + 1 WHERE fid = '$fid'") or die_query(4);//add one post to total
#query is a custom function
update supports multiple tables, but I don't remember if it supports setting only various fields from each at the same time. Maybe you should read your database server's documentation on update queries.