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Because of the success and the workload that comes with it I want to change my pages from .html to .php so I can make a database driven site to ease the content management; my question is how can I change the pages without losing my hard earned PR?
once you change your website urls/web page extention of your website you will lost your Google Page Rank(s) must, but i will recomend you to dont change your home page extention which will help you to gain the page rank for new urls/pages later on.
You can find out a lot more about server side redirection at the apache forum.
Here is a good example...