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I use php.net [php.net], all the time. It is the absolute language reference.
What exactly are you trying to do. You don't necessarily need to convert static html to php just for the sake. Are you connecting to a db? or have dynamic content? or need some specific functionality?
You just fit your php around the html where needed and name the page with a .php extension
echo "Your php code here";
<font color="red">HTML code here</font>
echo "More php here";
So you see that you don't have to do anything with the html. Just put the php where needed and don't forget that the page has to be renamed with a .php extension.