A preamble:
I\'ve been using PHP for over 8 year every now and then, but never used a framework, only wrote scripts and addons.
Mostly I used code generators like CodeCharge Stu
We have a tool that can help: nWire for PHP analyzes your code, helps you navigate through it and visually represents components and associations. You will eventually need to read the code and with nWire this becomes much easier.