SORT - ORDER BY , more than one ?

[fla5h]

nice one Xenon, can you possibly help me further I am have problems doing what I want.

I wanted to make a link on the forum threads ( in the forumdisplay ) so that users can click on them and sort them in set order.

Ie a link next to the thread starters name that when pressed sorts the posts in that thread but also sorts them in the order of lastpost.

So the link I have tried is

/forumdisplay.php?s=&forumid=$forumid&sortfield=pos tusername,%20lastpost&sortorder=asc

It dont work, so I tried this

/forumdisplay.php?s=&forumid=$forumid&sortfield=tes t&sortorder=asc

then in forumdisplay found

PHP Code:

switch ($sortfield) {
  case 'title':
  case 'lastpost':
  case 'replycount':
  case 'views':
  case 'postusername':
  case 'voteavg': 


And added

PHP Code:

case 'test': 


after it, and found

PHP Code:

if ($sortfield=="voteavg" and !$foruminfo[allowratings]) {
  $sortfield="lastpost";
} 


and added after it

PHP Code:

if ($sortfield=="test"){
    $sortfield="postusername, lastpost";
    } 


I get the error

Parse error: parse error, unexpected ',', expecting ']' in C:\Network\Apache2\htdocs\request\forumdisplay.php (702) : eval()'d code on line 1

It dont seem to work even with the error there ?

Can you point me in the direction as to what I need to change ?

Thanks