PHP Power
Refresh this page a few times and you will see that the silver gradient changes each time the page loads. This is because the background image is being generated by a PHP script each time the page is called.
PHP allows for endless possabilities on a web page. It can interact with a database, handle and generate secure transmissions, securely manage file uploads and downloads, dynamicly generate various types of files including images pdfs zips, remembering page settings that the user specifies, and more.
On the next page you will find links to other sites illustrating some of the things that can be done with php.