获取用户ip

public function getIp(){       //浏览当前页面的用户计算机的网关       if(@$_SERVER["HTTP_X_FORWARDED_FOR"]){           $ip = $_SERVER["HTTP_X_FORWARED_FOR"];        }else if(@$_SERVER["HTTP_CLIENT_IP"]){           //客户端的ip           $ip = $_SERVER["HTTP_CLIENT_IP"];       }else if(@$_SERVER["REMOTE_ADDR"]){           //浏览当前页面的用户计算机的ip地址           $ip = $_SERVER["REMOTE_ADDR"];       }else if(@getenv("HTTP_X_FORWARED_FOR")){           $ip = getenv("HTTP_X_FORWARED_FOR");       }else if(@getenv("HTTP_CLIENT_IP")){           $ip = getenv("HTTP_CLIENT_IP");       }else if(@getenv("REMOTE_ADDR")){           $ip = getenv("REMOTE_ADDR");       }else{           $ip = "Unknown";       }              return $ip;   }