global.php

[Wizardjv]

Ok so I wrote a private script I only want certain usergroups to see. But the problem im having is when I use the global.php to set the permision like:

<?php

require('./global.php');   ?>

<? 
if (!is_member_of($vbulletin->userinfo, 13))
{
    print_no_permission();
}  
?>

It breaks my php script because of the certain variables set in the global php

Is there any other way I could restrict access by certain usergroups without the global.php. Or maybe someone could tell me exactly what part of the global php is the part that sets the permissions like that. And I could just create a new file to tie the permissions into.

Any help would be greatly appreciated.