Over the past three years PHP has evolved from being a niche language used to add dynamic functionality to small sites to a powerful tool making strong inroads into large-scale, business-critical web systems.
The rapid maturation of PHP has created a skeptical population of users from more traditional "enterprise" languages who question the readiness and ability of PHP to scale, as well as a large population of PHP developers without formal computer science backgrounds who have learned through the hands-on experimentation while developing small and midsize applications in PHP.
While there are many books on learning PHP and developing small applications with it, there is a serious lack of information on scaling PHP for large-scale, business-critical systems. Schlossnagle's Advanced PHP Programming fills that void, demonstrating that PHP is ready for enterprise web applications by showing the reader how to develop PHP-based applications for maximum performance, stability, and extensibility.
This book just got me excited about PHP again.
For the first time in three years, I feel wonderfully over my head with a LOT to learn here in this one amazing book.
~ Derek Sivers, from his ONLamp review.
Advanced PHP Programming is excellent.
The coverage of Zend internals and extending PHP is the best I've seen.
~ Harry Fuecks, from his SitePoint review.