W Jason Gilmore 
Programmer’s Introduction to PHP 4.0 [PDF ebook] 

No matter what language you are familiar with, this book will benefit you. 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. Author W. J. Gilmore also examines how PHP can work with XML, Java Script, and the Component Object Model (COM). He loads the book with practical examples and several projects that can be immediately incorporated on any website. The invaluable A Programmer’s Introduction to PHP 4.0 shows you how to make the most of PHP’s powerful capabilities, regardless of your current scope of PHP knowledge.