From the back cover:
PHP is a simple yet powerful open source scripting language for creating web content. The second edition of the PHP Pocket Reference is thoroughly updated to include the specifics of PHP 4, the latest version of the language.
Written by the founder of the PHP project, Rasmus Lerdorf, the PHP Pocket Reference outlines the basic syntax and structure of PHP, providing a fast-paced tutorial for learning the basics of developing web applications with PHP. The book also provides aquick reference to the vast array of functions provided by PHP. The quick reference section organizes all the core functions of PHP alphabetically, so you can find what you need easily.
This valuable little book provides an authoritative overview of PHP packed into a pocket-sized guide that’s easy to take anywhere. It is also the ideal companion for O’Reill’s comprehensive book on PHP, Programming PHP. The PHP Pocket Reference is an indispensable tool for any serious PHP programmer.