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...
textfiles.com : What this site offers is a glimpse into the history of writers and artists bound by the 128 characters that the American Standard Code for Information...
Inj3ct0r 1337day.com : Exploit database separated by exploit type (local, remote, DoS, Poc, etc.)
Silex : The PHP micro-framework based on Symfony2 Components
The CMS Matrix : CMSmatrix lets you easily compare the features in over 1200 content management system products. Check the boxes next to the software you're interested...
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).