Is there away of sending a message to more than one user via the url e.g /message/new/80,1,181

Have you tried out your suggestion? :)

It should already work exactly like you suggested, you can specify multiple user ids with a ,.

If it does not work, then it's a bug but I've just tested it on a website with 1.0 and it works correctly.

02.05.2009

Oh yeah, there were some chances since then :)

The part that does this is in http://blog.worldempire.ch/de/api/function/privatemsg_new/1, especially that part:

 // convert recipients to array of user objects
  if (!empty($recipients) && is_string($recipients) || is_int($recipients)) {
    $recipients = _privatemsg_generate_user_array($recipients);
  }

That function probably doesn't exist in your version so you need to copy that one too.

Also you need to change more then just the above lines in privatemsg_new(), good luck with that :)

PS: Atleast the current version of privatemsg is designed to be as flexible as possible and offer many hooks that allow to customize the module without changing the source code. If you need to change something, you're welcome to ask here or look through the apidocs (see link above) before hacking the code.

Also, Patches which add functionally that is also interesting for other users are always welcome :)