“PHP: The Right Way”, by Josh Lockhart, is an easy-to-read, quick reference for PHP best practices, accepted coding standards, and links to authoritative tutorials around the Web.
Free PHP Books
“PHP Best Practices: A short, practical guide for common and confusing PHP tasks” is an attempt to compile a set of basic instructions for what can be considered best practices for common and confusing issues and tasks in PHP. If a low-level task has multiple and confusing approaches in PHP, it belongs here.
“More with symfony 1.3 & 1.4: Learn from symfony experts” is free to read online. It is part of the official symfony documentation. This book is available in five languages (English, French, Italian, Spanish, and Japanese).
“A Gentle Introduction to symfony 1.4” is free to read online. This book introduces you to symfony, the leading framework for PHP developers, showing you how to wield its many features to develop web applications faster and more efficiently, even if you only know a bit of PHP.
Download this free PHP eBook, “Practical PHP Testing” by Giogio Sironi. This practical testing book is aimed to php developers.
The “Practical symfony” book shows you all it takes to build up a complete and effective application from scratch. Definitely the best way to learn symfony.
Download “The symfony Reference Guide” for free in pdf format or read it online. The Symfony Reference Guide is a book where you can easily find answers to your questions at your fingertips.
Free eBook “Doctrine ORM for PHP”. The Guide to Doctrine for PHP is the main source of documentation for the project.
Free ebook offer “Building Online Communities with phpBB” from Packt Publishing. A practical guide to creating and maintaining online discussion forums with phpBB, the leading free open source PHP/MySQL-based bulletin board.
Free ebook “The PEAR Installer Manifesto” from Packt Publishing. PEAR Installer is the preferred PHP software for installing PHP components.