获得用户的真实IP地址

/** * 获得用户的真实IP地址 * * @access  public * @return  string */if (!function_exists(‘get_real_ip‘)){   function get_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;   }}

原文地址：https://www.cnblogs.com/php-linux/p/9908484.html