Found this via
Tucows: "
PHP 5 Power Programming is one of the books in
Bruce Perens' Open Source Series published by Prentice Hall. Written by Andi "The 'nd' in 'Zend'" Gutmans, Stig Bakken and Derick Rethans, this book has an average rating of 4 our 5 stars on its page at Amazon.com and is generally intended for the experienced PHP 4 programmer or the programmer who's mastered the basics of PHP 5 and wants to move to the next level."
Click here to download the book (PDF).