Free PHP books

The PHP Anthology: 101 Essential Tips, Tricks & Hacks, 2nd Edition
Free 207 Page eBook. The PHP Anthology will save you time, and eliminate the frustration of completing PHP tasks, with a comprehensive collection of ready-to-use solutions. If you're building web applications with PHP you'll never let this book out of your site! (For visitors from USA, Canada, Mexico, United Kingdom only.)

PHP 5 Power Programming
This is a free php book from Bruce Perens' Open Source Series. In this book, PHP 5's co-creator and two leading PHP developers show you how to make the most of PHP 5's industrial-strength enhancements in any project - no matter how large or complex.

A Programmer's Introduction to PHP 4.0
This is a free php book from Apress. Beginning with a rapid introduction to PHP's syntax and basic functionality, you will swiftly understand PHP. The book then steers you toward advanced issues, like PHP's role in database manipulation, sessions, and user interactivity.

Practical PHP Programming
Free online php book by Paul Hudson. It covers topics like Simple variables and operators, Functions, Arrays, Objects, HTML Forms, Files, Databases, Cookies and Sessions, Multimedia, XML & XSLT, Output Buffering and Java and COM.

PHP Manual
The official php documentation PHP manual is available in many formats.

Build Your Own Database Driven Website Using PHP & MySQL
Four chapters can be downloaded from Build Your Own Database Driven Website Using PHP & MySQL.