Codice PHP:
<html>

<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<meta name="generator" content="Adobe GoLive" />
<title>index</title>
</head>

<body bgcolor="#ffffff">
<form action="<?php $_SERVER['PHP_SELF'] ?>" method="post" name="Form">
<input type="text" name="ciao" value="0" size="24" />


<input type="[B]submit[/B] " name="submit" value="ok" /></p>

<?php
if (isset($_POST['submit']))

{
$ans = $_POST['ciao'];
echo $ans;
}?>


</form>


</p>
</body>

</html>