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【PHP】客户端IP

作者:养在鱼缸的鱼 / 发布于2014/4/8/ 511

function real_ip()
{
  static $realip = NULL;

  if ($realip !== NULL)
  {
    return $realip;
  }

  if (isset($_SERVER))
  {
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
    {
      $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);

      /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
      foreach ($arr AS $ip)
      {
        $ip = trim($ip);

        if ($ip != 'unknown')
        {
          $realip = $ip;

          break;
        }
      }
    }
    elseif (isset($_SERVER['HTTP_CLIENT_IP']))
    {
      $realip = $_SERVER['HTTP_CLIENT_IP'];
    }
    else
    {
      if (isset($_SERVER['REMOTE_ADDR']))
      {
        $realip = $_SERVER['REMOTE_ADDR'];
      }
      else
      {
        $realip = '0.0.0.0';
      }
    }
  }
  else
  {
    if (getenv('HTTP_X_FORWARDED_FOR'))
    {
      $realip = getenv('HTTP_X_FORWARDED_FOR');
    }
    elseif (getenv('HTTP_CLIENT_IP'))
    {
      $realip = getenv('HTTP_CLIENT_IP');
    }
    else
    {
      $realip = getenv('REMOTE_ADDR');
    }
  }

  preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
  $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

  return $realip;
}

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