The document provides an overview of PHP including: - A brief history of PHP from its creation in 1995 to the present. - An introduction to PHP's scripting syntax and basic language features like variables, data types, and functions. - A discussion of PHP's portability across Linux and Windows and tips for code reuse. - An overview of built-in PHP functions covering areas like arrays, dates, files, databases and more. - Information on upcoming features in PHP 5 like complete object support.