百度收录推送接口的问题？

Question

这是他们的案例，

$api = 'http://data.zz.baidu.com/urls?site=https://www.ougulun.com&token=aY5FTw2Djsac7TaO';

这里面的urls和上面的$urls好像没关系吧？这块需要怎么传？

$urls = array(
    'http://www.example.com/1.html',
    'http://www.example.com/2.html',
);
$api = 'http://data.zz.baidu.com/urls?site=https://www.ougulun.com&token=aY5FTw2Djsac7TaO';
$ch = curl_init();
$options =  array(
    CURLOPT_URL => $api,
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POSTFIELDS => implode("\n", $urls),
    CURLOPT_HTTPHEADER => array('Content-Type: text/plain'),
);
curl_setopt_array($ch, $options);
$result = curl_exec($ch);
echo $result;