This is a CGI shell script that aims to launch a php script using the PHP CLI binary (not CGI).
Due to limitations of the PHP CLI mode, the script has to handle parameters (GET/POST) and cookies (set/get) by itself.
This should be all transparent to the launched PHP file. For example, PunBB seems to run fine through this CGI script.
This script is intended to be run inside low-resource web servers, or when you don't have the permissions or disk space for installing a server such as Apache. I personally like and use Mathopd a lot (http://www.mathopd.org/), on GNU/Linux.
These details are provided for information only. No information here is legal advice and should not be used as such.