Get the Whitepaper called State Of The Art Post Exploitation In Hardened PHP Environments.
You can download it from the following link: https://packetstormsecurity.com/files/download/97407/php-exploit.pdf
Source: https://packetstormsecurity.com/files/97407/State-Of-The-Art-Post-Exploitation-In-Hardened-PHP-Environments.html