The second edition of Programming PHP was recently published. The O'Reilly press release said:

Rasmus Lerdorf and Kevin Tatroe provided the guidelines for this book. The newest author is Peter MacIntyre, a Zend Certified Engineer with more than five years experience in PHP. Wez Furlong and Chris Shiflett also contributed. Furlong modernized the "Extending PHP" chapter, and Shiflett brought his renowned expertise in updating the "Security" chapter.