Untitled

<body>
<form action="test.php" method="post">
number: <input type="text" name="num1" value=""/><br />
number: <input type="text" name="num2" value=""/><br />
<input type="submit" name="submit" /><br />
</form>
</body>
</html>
<?php
if(isset($_POST['submit'])) {
$num1=$_POST['num1'];
$num2=$_POST['num2'];
echo $num1+$num2;
}
?>