<html>
<body>
<form action="ex3-11.php" method="get">
<input type="text" name="foo" value="">
<input type="submit" value="Try it!">
</form>
<?php
$foo = $_GET["foo"];
if ($foo == "yes") {
echo "Yes";
} elseif ($foo == "no") {
echo "No";
} else {
echo "Maybe";
}
?>
</body>
</html>