Template based generated website project.

Hi All, I'm really just looking for some advice! I am looking to build a website which users will be able to logon and have a template based website generated for them, the output will have to be HTML so that these sites can be indexed by search engines, it will also have to change Apache conf files and DNS records. Perhaps someone knows of a similar open source project or could point me in the right direction. My idea is to create the site using PHP, making use of a number of different templates which will be PHP pages that have the same includes i.e Navigation, Header, Footer, Content etc. Once the pages have been generated (view source) all you have is the HTML, this is what I would like to achieve, but I'm unsure how to pass the pages to give me only HTML from the databases. Any help or advice would be greatly appreciated. -- Tony Burgess