It says undefined variable on line 15 and 16, am I referencing the get variables wrong?
<html>
<head>
<title>
php
</title>
</head>
<body>
<?php
print "Your first number is: {$_GET['Name']}<br />";
print "Your second number is: {$_GET['Number']}<br />";
if(isset($_GET['Mult'])) {
$_GET['Name'] * $_GET['Number'] = $total;
print $total;
} elseif (isset($_GET['Div'])) {
$_GET['Name'] / $_GET['Number'] = $total;
print $total;
} elseif (isset($_GET['Add'])) {
$_GET['Name'] + $_GET['Number'] = $total;
print $total;
} elseif (isset($_GET['Sub'])) {
$_GET['Name'] - $_GET['Number'] = $total;
print $total;
} else {
Print "You did not pick a sign!\n";
}
?>
</body>
</html>