What is the code

@ShrineDesignsAug 15.2005 — #

$_SERVER['HTTP_USER_AGENT']
 $_SERVER['REMOTE_ADDR']

@Stephen_PhilbinAug 15.2005 — #Firewalls can (and often do) prevent the sending of info like refferers, browser data, and OS info though. Don't go building any applications that depend on that sort of info to work. It just won't work for a very large number of people.

@bokehAug 15.2005 — #$_SERVER['REMOTE_ADDR'] may be a proxy and not the user's IP.

@ShrineDesignsAug 15.2005 — #i converted this from python to php (bittorrent)

[code=php]function _get_forwarded_ip($headers)
 {
 if(array_key_exists('HTTP_X_FORWARDED_FOR', $headers))
 {
 $h = $headers['HTTP_X_FORWARDED_FOR'];
 
   if(strpos($h, ','))
   {
   list($x, $y) = explode(',', $h);
 
   if(!is_local_ip($x))
   {
   return $x;
   }
   return $y;
   }
   else
   {
   return $h;
   }
  }
  if(array_key_exists('HTTP_CLIENT_IP', $headers))
  {
   return $headers['HTTP_CLIENT_IP'];
  }
  if(array_key_exists('HTTP_VIA', $headers))
  {
   if(preg_match("([0-9.]+)Z", $headers['HTTP_VIA'], $x))
   {
   return $x[1];
   }
  }
  if(array_key_exists('HTTP_FROM', $headers))
  {
   return $headers['HTTP_FROM'];
  }
 }
 function get_forwarded_ip($headers)
 {
 $x = _get_forwarded_ip($headers);
 
  if(is_null($x) || !is_valid_ipv4($x) || is_local_ip($x))
  {
   return NULL;
  }
  return $x;
 }
 function is_valid_ipv4($ip)
 {
 $a = explode('.', $ip);
 
  if(count($a) != 4)
  {
   return false;
  }
  foreach($a as $x)
  {
   if($x > 255 || $x < 0)
   {
   return false;
   }
  }
  return true;
 }
 function is_local_ip($ip)
 {
 $v = explode('.', $ip);
 
  if($v[0] == 10 || $v[0] == 127 || in_array(array_slice($v, 0, 2), array(array(192, 168), array(169, 254))))
  {
   return true;
  }
  if($v[0] == 172 && $v[1] >= 16 && $v[1] <= 31)
  {
   return true;
  }
  return false;
 }[/code]

example

[code=php]<?php
 // ...
 $_SYSTEM = array_merge($_SERVER, $_ENV);
 
 $ip = $_SERVER['REMOTE_ADDR'];
 $nip = get_forwarded_ip($_SYSTEM);
 
 if($nip && is_local_ip($ip))
 {
 $ip = $nip;
 }
 // ...
 ?>[/code]

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