Start multiple network pages of the same type, unqiue to network with PHP

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This is a general question regarding PHP so I apologize if it is posted in the wrong section.

 

I was looking at digg the other day, and I was wondering if something could be done with it.

 

Would it be possible to create an individual digg-like website, with all the functionality, but only show the digg site to the user who belongs to that network.

 

 

For example, let's say I have a digg site for California, and a digg site for Florida, is there any way to do this, and would it help to use PHP's class/object oriented features?

 

Possible with PHP/MySQL?

 

Thanks for any advice.