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...
Idiorm and Paris : A minimalist database toolkit for PHP5.
Object relational mapper (ORM), fluent SQL query builder and Active Record implementation for PHP.
TCPDF : TCPDF is a FLOSS PHP class for generating PDF documents.
Psalm : Psalm is a static analysis tool for finding errors in PHP applications.
Keep a Changelog : Don’t let your friends dump git logs into changelogs.
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).