Giorgio Sironi has posted a review of a book he's recently gone through and shares some of his thoughts on the book's contents and how well he thinks it reaches its target audience - "PHP in Action".
It is very rare to encounter a book like this, which teaches object-oriented programming from a non naive point of view (How do I write those "classes?") in the PHP environment. PHP is still catching up with other languages in this field and many developers can only benefit from improving their modeling skills and design practices.
He talks about the topics the book focuses on including a bit of information on design pattern and test-driven development as well as some of the basics of really getting to know the PHP language. This isn't a beginner book, though - as Giorgio notes:
The average developer which has a deep understanding of the PHP technology will find this book useful to start upgrading his skills to the next level. [...] The level of the book is adequate for the intermediate coder, thus I found it easy to read. Nevertheless, it is a good panoramic of the PHP landscape in term of the transition to object-oriented programming.