ve lo rimetto in ordine e lo posto, eccolo sotto

form.php
codice:
]<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento senza titolo</title>
</head>

<body>
<form action="azione.php">
<TEXTAREA cols=50 rows=4 WRAP="physical" name="commento"></textarea>
<INPUT type="SUBMIT" value="Invia">
</form>


</body>
</html>
azione.php
codice:
<?php
$file = fopen('file1.txt', 'w'); 
fwrite($file , $_POST['form.php']); 
fclose($file );
?>