How do I add user group permissions to an independent PHP file?

I created a new, run-of-the-mill PHP file in my Xenforo directory called ShowVideo.php.

I don't want unregistered users to be able to view this PHP file however. How would I prevent unregistered users from viewing it, using PHP if possible ?

 

I found an alternative solution... BUT it would still be cool if I can do the above to add an extra layer of security

 

Well, you'd have to integrate the core XenForo framework by loading the autoloader and dependency classes etc, then perform a user check.

http://xenforo.com/community/threads/get-user-information-custom-field-in-kotomi-script.35003/

 

8 months later, by the way, Thanks!!