What is PHP?
PHP Version 3.0 is an HTML-embedded scripting language. Much of its syntax is borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in. The goal of the language is to allow web developers to write dynamically generated pages quickly.

PHP implements an easy-to-learn HTML-embedded scripting language. It supports a number of RDBMS packages including Adabas-D, mSQL 1, mSQL 2, MySQL, FilePro, Solid, Postgres95, PostgreSQL, Oracle, Sybase as well as many others via standard ODBC.

PHP Home Page

Information about PHP in Unisite
PHP Version: 3.0.12, 4.0
Web Server: Unix: Apache 1.3.12
Windows: MS IIS 4.0
File Extension: .php3, .php4, php
Source: .phps

Documentation
The documentation is your first stop for general information and those questions that seem to be on most people's minds of PHP.
PHP Manual Online
PHP 3.0 FAQ
PHP/FI 2.0 Manual