Twitter api - POST状态/ OAuth过滤器

现在我使用这段代码从twitter获取流，它工作得很好。但是很快，使用用户和密码的基本验证将被弃用，我如何使用oauth发送此请求?

$fp = fsockopen("ssl://stream.twitter.com", 443, $errno, $errstr, 30);
            if (!$fp)
            {
                echo "ERROR: Twitter Stream Error: failed to open socket";
            } else
            {

                $request  = "GET /1.1/statuses/filter.json?track=";
                $request .= urlencode(implode($_keywords, ',')) . " HTTP/1.1'r'n";
                $request .= "Host: stream.twitter.com'r'n";
                $request .= "Authorization: Basic ";
                $request .= base64_encode($this->m_username . ':' . $this->m_password);
                $request .= "'r'n'r'n";