PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.
Note: This is a beta version. It should not be used in production or even semi-production web sites. There are known bugs in it, and in addition, some of the features may change (based on feedback). We encourage you to download and play with it (and report bugs if you find any!), but please do not replace your production installations of PHP 4 at this time.