PHP and HTML are not the same thing. HTML displays stuff to a user's browser. PHP does calculation, database queries, and general decision-making. So you don't just convert to PHP. PHP gets interlaced with your HTML to make decisions about what to do/display on the fly. For instance:
<html><head></head>
<body>
<?
if($var1 <= 0)
echo "Man, I am a homo!";
else
echo "Man, you are a homo!";
?>
</body>
</html>
As you'll notive, this little script has both PHP and HTML in it. Using PHP on the web is impossible without HTML. When you view the source of a .php page, you do not see any PHP. You see nothing, but HTML.
Hence, there is no way to simply convert a static HTML page to a dynamic PHP page in one fell swoop.
