PHP 5 Power Programming
by Andi Gutmans, Stig Bakken, Derick Rethans
Publisher: Prentice Hall PTR 2004
Number of pages: 720
This book is an introduction to the advanced features new to PHP 5. It is written for PHP programmers who are making the move to PHP 5. Although Chapter 2, 'PHP 5 Basic Language', contains an introduction to PHP 5 syntax, it is meant as a refresher for PHP programmers and not as a tutorial for new programmers.
Download or read it online for free here:
by Mario Lurig
A collection of over 250 PHP functions with clear explanations in language anyone can understand, followed with examples. The book includes numerous additional tips, the basics of PHP, MySQL query examples, regular expressions syntax, etc.
by Josh Lockhart - phptherightway.com
There's a lot of outdated information on the Web that leads new PHP users astray, propagating bad practices and bad code. This must stop. PHP: The Right Way is an easy-to-read, quick reference for PHP best practices and accepted coding standards.
by Penn Wu - The Global Text Project
by Luis Atencio - Leanpub
I provide a practical approach to functional programming and show how it compares to other programming paradigms. The book is filled with examples that showcase functional concepts, plus using PHP in a ways you've probably never though it could.