PHP Backboor by ZeroByte.ID (For Educational Purposes Only).
A standalone PHP backdoor for use on *nix and Windows systems.
Non-Official Repo For Web Backdoor Compilation
Proof-of-concept to exploit the flaw in the PHP-GD built-in function, imagecreatefromgif()
PHP / ASP - Shell Backdoor List
A collection of PHP backdoors. For educational or testing purposes only.