Script is based on the PHProxy , A2 is a web HTTP proxy programmed in PHP meant to bypass firewalls and access otherwise inaccessible resources (i.e. blocked websites). If the server this script is run on can access a resource, so can you!
PHProxy is a PHP based web proxy that allows users to browse the net without restrictions and anonymously, without having to modify their browser's SOCKS proxy options. Its aims are to be easy to use and lightweight.