vB powered PHP pages

[lightnb]

I read through the tutorial on how to make a vB powered page that uses a template, but what do I need to do if I have a pre-existing PHP script (that needs to parse as PHP) that I want to add vb functions to?

I have tried adding this to the begining of my script:

PHP Code:

require_once('http://www.domain.com/livexchange/forums/global.php');
require_once('http://www.domain.com/livexchange/forums/includes/functions_bigthree.php');
require_once('http://www.domain.com/livexchange/forums//includes/functions_forumlist.php');


if (!($permissions['forumpermissions'] & $vbulletin->bf_ugp_forumpermissions['canview']))
    {
    print_no_permission();
    } 


But get a call to undefined function 'print_no_permission' error. Presumably I havn't included the right file?

Has anyone successfull got an external PHP script to use the vB login/permissions system? I want to be able to check to see which user group a person is in, and have my script react based on that.

Thanks