Mine

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
 
<html>
<head>
 
        <title>Untitled</title>
 
</head>
 
<body>
<?php if(!isset($_POST['submit'])) { ?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
 <p>Your name: <input type="text" name="name" /></p>
 <p>Your age: <input type="text" name="age" /></p>
 <p><input type="submit" name="submit" value="Whats my name!" /></p>
</form>
<?php } else { ?>
Hi <?php echo $_POST['name']; ?>.
You are <?php echo $_POST['age']; ?> years old.
<?php } ?>
</body>
</html>