How to let users with required permission download a file via php?

Question

I have a php file that acts as a gatekeeper for all the files I want people to download, who ahve sufficient privilages.

The code I use throw the file to the user i

Answer 1

You're already doing that - the $public_filename is what you want it called, the readfile($file_path) part is the file - it's location isn't made public. Past that, it could be above the document root.