From PHP Magazine:

Slashdot has a new post this morning that offers a positive review of the excellent book, "PHP 5 Power Programming" by Andi Gutmans, Stig Bakken, and Derick Rethans. "PHP 5 Power Programming is the latest in the Bruce Perens Open Source series of technical books focusing on Linux and Open Source technologies. Prentice Hall PTR publishes each book under an Open Source book license and provides free electronic versions several months after each book's publication. This particular book also includes a link to a 90-day version of Zend Studio, an IDE for PHP which also includes a PHP debugger, code analyzer and code profiler.

PHP 5 Power Programming was written by Andy Gutmans (co-creator of PHP versions 3 through 5), Stig Bakken (creator of PEAR -- the PHP Extension and Application Repository -- a framework and distribution system for reusable PHP components) and Derick Rethans (leader of the PHP QA team). The move to PHP 5 has begun and this volume will prepare power users with the necessary knowledge and tools to make the transition from v.4 easy. Gutman et al. provide PHP engineers and experienced web programmers a proficient introduction to the enhancements and improvements in PHP 5." Read on for the rest of the review.

The book covers a wide range of topics including what's new for PHP 5, OOP design patterns, an in-depth look at PHP and databases, XML and PHP, and an intro to writing PHP extensions. Looks like the average price on this one is going to be between -35 USD.