[Velocd]

vBulletin's global.php requires other files to be included.

If you try to require global.php from your root directory, global.php will assume the files it needs to require will also be relative to your root's index.php, which is not the case.

So you need PHP to change directories for you, with chdir().

yoursite.com/index.php:

PHP Code:

chdir('./forum');

require_once('./global.php');