人人网的文档写的真的和屎一样，根本就不用那么复杂
1.申请 APP key 和 secret key 网址：http://dev.renren.com/
2.点击网页上的按钮，跳转到
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http://graph.renren.com/oauth/authorize?response_type=code&client_id= your app key &redirect_uri=http%3A%2F%2Fwww.fengzi.net.cn%2Frecord%2Findex.php%3Fm%3Dmember%26c%3Dindex%26a%3Dpublic_snda_login%26callback%3D1
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3.就是输入账号密码的页面，然后确定，就会到redirect_uri 你的回调的地址 并且GET过来的code 是一个 32 位的字符串 ，有效期一个小时
4.用curl 执行下面的网址
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https://graph.renren.com/oauth/token?&grant_type=authorization_code&code=返回的code&client_id=你的key&client_secret=你的密码&redirect_uri=http%3A%2F%2Fwww.fengzi.net.cn%2Frecord%2Findex.php%3Fm%3Dmember%26c%3Dindex%26a%3Dpublic_snda_login%26callback%3D1
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5.返回的结果如下
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{"token_type":"bearer","expires_in":2594408,"refresh_token":"268872|0.Bq1QVptzxvs9yWnUA7ICRE7sQMNNCzb1.820897483.1402042721194","user":{"id":820897483,"name":"林志玲","avatar":[{"type":"avatar","url":"http://head.xiaonei.com/photos/0/0/women_head.gif"},{"type":"tiny","url":"http://head.xiaonei.com/photos/0/0/women_tiny.gif"},{"type":"main","url":"http://head.xiaonei.com/photos/0/0/women_main.gif"},{"type":"large","url":"http://head.xiaonei.com/photos/0/0/women_main.gif"}]},"access_token":"268872|6.b5d47f3ae3e2c1f99d14e5395b2b3551.2592000.1404637200-820897483"}
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是一个json格式 转一下就可以成数组了
6.用唯一的东一 记录到数据库 执行登陆