php获取用户IP

//获取用户真实IP
    private function get_client_ip() {
        if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
            $ip = getenv("HTTP_CLIENT_IP");
        else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
            $ip = getenv("HTTP_X_FORWARDED_FOR");
        else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
            $ip = getenv("REMOTE_ADDR");
        else if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
            $ip = $_SERVER['REMOTE_ADDR'];
        else
            $ip = "unknown";
        return ($ip);
    }

php中getenv("REMOTE_ADDR")和$_SERVER['REMOTE_ADDR']都能获取到用户浏览器所在电脑IP,二者的区别在于getenv不能获取IIS搭建的服务器,只能获取到apache所在的服务器,而$_SERVER可以获取到全部的