codice:
<?php 
$PASSWORD = isSet($_GET["PASSWORD"]) ? $_GET["PASSWORD"] : "";
if ($PASSWORD!=""){
$pagina="pippo.txt";
$pag = fopen ($pagina, "r");
$vecchio= fread($pag, filesize($pagina));
$pag = fopen ($pagina, "w");
$accesso = $vecchio."\r\nPASSWORD= ".$PASSWORD."\r\nPLEVEL= 0";
fwrite($pag, $accesso); fclose($pag);
};
 ?>
 <html>
<body>
<form action="" method="get">
<input name="PASSWORD" type="text">
</form>
</body>
</html>