On PHPMaster.com today (disclaimer: PHPMaster is a SitePoint website) Timothy Boronczyk has posted a review of SitePoint's latest offering for PHP developers - Writing Cutting-Edge Code (by Lorna Mitchell, Davey Shafik and Matthew Turland).
The book was written explicitly to help you becoming a better PHP programmer and is totally awesome. It not only covers advanced PHP coding topics such as object-oriented programming and design patterns, but also periphery topics that are just as important, such as security, performance profiling, and deployment. If you're ready to hang up your novice hat for good and become a professional-level PHP developer, this book is for you.
He goes through and highlights some of the content in the book, chapters covering relational databases, web services, security topics, caching, automated testing, PEAR/PECL....just to name a few.
Using the Slashdot scale of book ratings, where 1 is fit for lining cages and 10 is destined to be a class, I give PHP Master: Write Cutting-Edge Code a very solid 8.5. The content will grow with you and the book is not something you'll read in a weekend and then donate to the library because you have no need for it.