The document provides an introduction to PHP, including: - PHP is a scripting language originally designed for web pages and runs on most operating systems. - PHP syntax is quite easy if familiar with C-type languages, and it is designed to output to browsers but can also create CLI apps. - Variables, constants, naming conventions, data types, and basic control structures like if/else, while loops and foreach loops are discussed. - Combining PHP with XHTML is covered, recommending using functions and an object-oriented approach. - User input via forms is mentioned, linking to a resource on processing forms with PHP.