script non funziona su php5

[piero.mac]

per esempio:

// tag esteso --- tutti --->>> <?php
<?php
if(!empty($_GET['nickname']) {
   $nickname = $_GET['nickname'];
   } else exit("manca nickname");

$nickname = str_replace ("\n"," ", $nickname);
$nickname = str_replace ("<", " ", $nickname);
$nickname = str_replace (">", " ", $nickname);
$nickname = stripslashes ($nickname);
?>

ma anche:

$indirizziIP = $REMOTE_ADDR; 

// deve diventare:

$indirizziIP = $_SERVER['REMOTE_ADDR']; 

etc, etc ....