SQL Injection Cheat Sheet : Samples are provided to allow reader to get basic idea of a potential SQL Injection attack and almost every section includes a brief information about...
churn-php : churn-php is a package that helps you identify php files in your project that could be good candidates for refactoring.
atoum : A simple, modern and intuitive unit testing framework for PHP!
PrePostPrint : PrePostPrint highlights experimental publications made with free software.
Inj3ct0r 1337day.com : Exploit database separated by exploit type (local, remote, DoS, Poc, etc.)
This is a collection of known design patterns and some sample code how to implement them in PHP. Every pattern has a small list of examples (most of them from Zend Framework, Symfony2 or Doctrine2 as I'm most familiar with this software).