"PHP Functions Essential Reference is a detailed and practical function reference for the PHP programming language. This working programmer's guide covers the core function groups plus 300 additional commonly used PHP functions, and details 800 more functions on the book's web site, php-er.com." Written by working developers and PHP community leaders, this book is full of working code that utilizers the rich variety of functions available with PHP. Every function is supported by one or more examples that illustrate the function in action. This guide to PHP is a must-have for any serious PHP programmer.