For the benefit of potential purchasers of this book I would like to explain in plain English what this book is and what it isn't. PHP Master is a book about concepts and theory for those looking to further their skills to a higher level. This book is NOT, I repeat not a 'How to program in PHP' book so please consider other Site-point books if your starting out your journey or after a book full of practical examples. I groaned when I read a previous review where that person was disgruntled because he/she considered it an arm-chair read...well yes that exactly what it is and no bad thing!
This book is about empowering you to write your own code a modern way, not to teach you programming. If you have moved on from being shown how to program and want to fine tune your technique this comes recommend.
I started using PHP 4 and I learned PHP 5 on the road with a lot of confusions and misunderstandings. It helped me understand PHP better while inspiring me using more up to date APIs and best practices. I would not recommended to novice PHP programmers but beside then this book is a treasure!