If you're a programmer looking for the most effective uses of PHP, this book will provide you with: A clear guide to common function usage and pitfalls; Easy to find, detailed information on the most important PHP functions; Practical examples of each function's use; Overview's that discuss how and why to use a particular group of functions; Practical, complete documentation on powerful but obscure functions such as pack and unpack. The web site for PHP Functions Essential Reference contains materials to support and expand on the book. Over 700 additional function writeups are available, along with updates, errata, and a few surprises.