PHP in a Nutshell is a complete reference to the core of the language, as well as the most popular PHP extensions. This book doesn't try to compete with or replace the widely available online documentation. Instead, it is designed to provide depth and breadth that can't be found elsewhere. PHP in a Nutshell provides the maximum information density on PHP, without all the fluff and extras that get in the way. The topic groupings, tips, and examples in this book complement the online guide and make it an essential reference for every PHP programmer. This book focuses on the functions commonly used by a majority of developers, so you can quickly look up the information you need.