PHP Reference: Beginner to Intermediate PHP5
by Mario Lurig
Number of pages: 163
A collection of over 250 PHP functions with clear explanations in language anyone can understand, followed with as many examples as it takes to understand what the function does and how it works. This book includes numerous additional tips, the basics of PHP, MySQL query examples, regular expressions syntax, and two indexes to help you find information faster: a common language index and a function index.
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by Pádraic Brady
A free book about Zend Framework for the PHP programming language. This is a survival guide, boosting your understanding of the framework and how it all fits together by following the development of a single application from start to finish.
by Paul Hudson
This book teaches PHP from scratch, no PHP programming skill is assumed. The topics are ordered in such a way as to allow newcomers to progress smoothly and quickly in their learning without having to copy thousands of lines of code.
by Matt Curry - PseudoCoder.com
Free e-book about the CakePHP Framework. It covers topics that are generally missed in the beginner books that are on the market. This book isn't meant for people wanting to learn CakePHP, use it if you want to improve your CakePHP skills.
A comprehensive guide to programming in PHP. Topics: Learning the Language - basics; Advanced PHP - Data Structures, Object Oriented Programming (OOP), Templating, Libraries, Frameworks, Security, Command-Line Interface (CLI); etc.