public static function get_proxied_for_header($out_headers, $forwarded_for, $current_ip) { if ($forwarded_for !== null && UBHTTP::is_private_ip_address($current_ip)) { $proxied_for = $forwarded_for; } else { $proxied_for = $current_ip; } $out_headers[] = 'X-Proxied-For: ' . $proxied_for; return $out_headers; }