Sovet 
Ragnar Lodbrok 
function get_ip_list()
{
$list = array();
if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
$ip = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
$list = array_merge($list, $ip);
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$ip = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
$list = array_merge($list, $ip);
} elseif (!empty($_SERVER['REMOTE_ADDR'])) {
$list[] = $_SERVER['REMOTE_ADDR'];
}
$list = array_unique($list);
return implode(',', $list);
}
