UCenter实现同步登陆的原理和流程
1、用户登录discuz，通过logging.php文件中的函数uc_user_login对post过来的数据进行验证，也就是对username和password进行验证。 2、如果验证成功，将调用位于uc_client下client.php文件中的函数uc_user_synlogin，在这个函数中调用 uc_api_post(user, synl
1、用户登录discuz，通过logging.php文件中的函数uc_user_login对post过来的数据进行验证，也就是对username和password进行验证。
2、如果验证成功，将调用位于uc_client下client.php文件中的函数uc_user_synlogin，在这个函数中调用 uc_api_post(‘user’, ‘synlogin’, array(‘uid’=>$uid))。
3、然后这个函数后向Ucenter的index.php传递数据,index.php接受传递的数据，获得model为user，action为synlogin的值。
4、然后Ucenter的index.php调用control目录下的user.php类中的onsynlogin方法，通过foreach循环，以javascript的方式通知uc应用列表中开启同步登陆的应用进行同步登录;即通过get方式传递给各个应用目录中api下的uc.php一些数据。
5、uc.php接收通知并处理get过来的数据，并在函数synlogin(位于uc.php中)通过函数_authcode加密数据(默认以UC_KEY作为密钥)，用函数_setcookie设置cookie。
6、各个应用用对应的密钥解码上面设置的cookie，得到用户id等数据;通过这个值来判断用户是否经过其它应用登录过，从而让用户可以自动登陆。
应用程序的logging.php ——>uc_client中的client.php——>Ucenter——>应用程序中api/uc.php
其实Ucenter实现同步登陆的原理就是cookie，一个应用登陆成功之后，向Ucenter传递数据，让Ucenter通知其他的应用也设置cookie，这样用户在访问其他应用的时候通过已经设置好的cookie实现自动登陆。了解了Ucenter的同步原理，再遇到无法同步登陆，或者开发一些与UCenter接口的时候就会容易很多。具体代码如下:
原文地址：UCenter实现同步登陆的原理和流程, 感谢原作者分享。
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