Giorgio Sironi has posted his quite impressive list of articles he's published on the DZone.com site to his blog today. They cover a wide range of topics - everything from refactoring to design patterns out to, well, lots of other random topics.
From 2010 to the end of 2013 I have written a few articles each week on DZone. Here is the full list as a reference.
Some of the posts fall into different "series" categories including "Practical PHP Patterns", "Practical PHP Refactoring", "Practical PHP Testing Patterns" and "Lean Tools". There's some great content here - and lots of it - so be sure to check out the list and see if there's anything that catches your eye!