html 2 php

Sorry just starting out, is there a simple way of converting an html page into php?

Elaborate on what it is you're looking to achieve.

What do you mean? If you want to see the source of a PHP page, its impossible; the server parses the PHP and outputs HTML. If you want to display HTML in a PHP file, just put it outside of the <? and ?> tags

Rename the file from .html to .php. Done.

PHP is a server side coding, it is processed by the server and outputs HTML. If your viewing a site in HTML there is no way to get the php source code that generates the HTML you're being shown. For more information you should read the PHP Manual at php.net.

Hope this helps,
- Phaaze