Intro PHP OOP articles

A nice series of articles just wrapped up at DevShed- Object Interaction in PHP, a good intro to object aggregation. Author Alejandro Gervasi lays it out nicely for novice/intermediate PHP developers- a good read, particularly if you've been hacking at procedural code 'til now. While you're at it, if this subject interests, you you'll likely want to learn a little bit about unit testing in this article by Saleh Jamal at DevPapers while you're at it- a skill that can save you a lot of debugging headaches down the road.