kapēc nedarbojas šis php skripts?

esmu iesācejs! Tas ir paraugs no grāmatas
<HTML>
<HEAD>
<TITLE>Form Results</TITLE>
<HEAD>
<BODY>
<?php /*si lapa sanem un apstrda datus,sanemtos no "form.html".*/
print ("Your first name is $FirstName.<BR>\n");
print ("Your last name is $LastName.<BR>\n");
print ("Your E-mail is $Email.<BR>\n");
print ("This is what you had to say:<BR>\n $Comments<BR>\n");
?>
<BODY>
</HTML>