documentation for script truth.php

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>the truth</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
</head>
<body>
<div>
You say that
<?php
 $prof=$_GET['prof'];
 print $prof;
?>
 is the finest professor in the Palmer School.
<?php 
if($prof=='Thomas') {
  print "This is correct.";
}
else {
  print "This is wrong.";
}
?>
</div>
<p>
<a href="http://validator.w3.org/check?uri=referer"><img
    style="border: 0pt"
    src="/valid-xhtml10.png"
    alt="Valid XHTML 1.0!" height="31" width="88" /></a>
</p>
</body>
</html>