documentation for script saar

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>result of your order</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
</head>
<body>
<div>Thank you for your order!</div>

<?php
$gross_pils=$_POST['gw_pils'];
$p_gross_pils=$_POST['p_gw_pils'];
$t_gross_pils=$p_gross_pils*$gross_pils;

$gross_expo=$_POST['gw_expo'];
$p_gross_expo=$_POST['p_gw_expo'];
$t_gross_expo=$p_gross_expo*$gross_expo;

$bruch_land=$_POST['bruch_land'];
$p_bruch_land=$_POST['p_bruch_land'];
$t_bruch_land=$p_bruch_land*$bruch_land;

$total_euro=$t_gross_pils
           +$t_gross_expo
           +$t_bruch_land;
$euro_rate=$_POST['euro_rate'];
$total_dollar=$total_euro*$euro_rate;

print "<div> You ordered <ul>";
print "<li>$gross_pils bottles of Grosswald Pils,
 cost $t_gross_pils</li>";
print "<li>$gross_expo bottles of Grosswald Export,
 cost $t_gross_expo</li>";
print "<li>$bruch_land bottles of Bruch Landbock,
 cost $t_bruch_land</li>";
print "</ul>";
print "Your bill is $total_dollar US dollars.<br/>";
print "We ship when we get your check!<br/>";
print "Prosit!</div>";

?>

<p id="validator">
<a href="http://validator.w3.org/check?uri=referer"><img
    style="border: 0pt"
    src="http://dlib.info/valid-xhtml10.png"
    alt="Valid XHTML 1.0!" height="31" width="88" /></a>
</p>
</body>
</html>