RPX提供了OpenID的托管服务，你所要做的，只是在网页中插入几行代码，剩下的全部由它来完成。

但是RPX提供的PHP示例代码，我想很多人未必会用，写的有点菜，我就没有用的起来。下面是我自己写的一个示例代码，供大家学习:)

<script src="https://rpxnow.com/openid/v2/widget"
     type="text/javascript"></script>
<script type="text/javascript">
RPXNOW.token_url = "http://freebapp.org/tools/openid/rpx.php";
RPXNOW.realm = "freebapp";
RPXNOW.overlay = true;
RPXNOW.language_preference = 'en';
</script>

<?php
if(!empty($_REQUEST['token'])){
$post['token'] = $_REQUEST['token'];
$post['apiKey'] = 'a21e795ea614c12f549660ab15f93de30451d338';
$post['format'] = 'json';

$curl = curl_init();
$url = 'https://rpxnow.com/api/v2/auth_info?token_url='.urlencode('http://freebapp.org/tools/openid/rpx.php');
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
curl_setopt($curl, CURLOPT_URL, $url);

$data = curl_exec($curl);
echo('<pre>');
print_r(json_decode($data));
echo('</pre>');
curl_close($curl);
}
?>

大家把上例的apiKey和token_url换成自己的就可以了！

示例演示