获取客户端真实ip

 // 获取客户端真实ip()
     protected function getIP()
     {
     global $ip;
     if (getenv("HTTP_CLIENT_IP"))
     $ip = getenv("HTTP_CLIENT_IP");
     else if(getenv("HTTP_X_FORWARDED_FOR"))
     $ip = getenv("HTTP_X_FORWARDED_FOR");
     else if(getenv("REMOTE_ADDR"))
     $ip = getenv("REMOTE_ADDR");
     else $ip = "Unknow";
     return $ip;
     }