PHPGGC is a library of unserialize() payloads along with a tool to generate them, from command line or programmatically. When encountering an unserialize on a website you don't have the code of, or simply when trying to build an exploit, this tool allows you to generate the payload without having to go through the tedious steps of finding gadgets and combining them.
Use PHP-FPM (FastCGI Process Manager) with a proper configuration. PHP-FPM does not suffer from this vulnerability because it does not parse command-line arguments from the web request. php 5416 exploit github
To mitigate this vulnerability, server administrators were advised to: PHPGGC is a library of unserialize() payloads along