Reading this book and practicing its code was what helped me transition from a regular PHP5 programmer to a professional one that understands Object Oriented aspects of PHP that is the highlight of PHP6.
This book has everything that is needed to make the transition.
The first 127 pages do a good job of describing classes, objects, and interfaces in PHP5. Then it goes into Advanced Development Techniques. Lastly in Pushing PHP to its limits, I found some interesting things.
So, in general, I liked this book as well as other books by the same publisher about PHP5, etc.
But three things seem to create some difficulties for me:
1. I think that they should have used mySQL as primary DB language.
2. The examples in this book are too involved. If you lose track at some point in the middle, then you might have a difficult time catching up later. This is so because the examples keep building complication on top of each other and a missing gap or a skipped section will prevent you from complete understanding of the rest of the book.
3. Book goes into tangential more than is needed. Planning and scheduling is not that related to this topic.
A copy of this book sits in front of me on my desk and I refer to it a lot as I write code.