Problem with Custom Page

[illustrationism]

Hey,

I read the very well-written tutorial here: https://vborg.vbsupport.ru/showthread.php?t=98009, but I am not having much success...

Pretty much, I have written a custom uploading script here:
www.whatever.com/upload

But the forums are here:
www.whatever.com/forums

The PHP parser stops (and I mean stops, no error or anything) at the line:

require_once('./global.php');

I wrote a quick script called testdavid.php in the /upload/ dorectory and commented out everything but $_SERVER['PHP_SELF']. It seems that the value of $PHP_SELF is empty, and the location of $_SERVER['PHP_SELF'] is /upload/testdavid.php. So I don't know what to use for chdir(). As of now, I only have access to the upload directory. Is there anything I can do, or that i may be doing wrong?

Thanks,
David