authcode()并不是PHP的内置函数,它是康盛开发的一个使用异或运算进行加密和解密的函数，可以说这是康盛对中国的PHP界作出的重大贡献。康盛自己的产品如Discuz，UCenter等以及许多使用PHP的中国公司都用这个函数进行加密。在前面的ThinkPHP3.1.2整合UCenter详解(四)的同步登录中authcode()就扮演者重要的角色。在同步登录（从项目登录到UCenter）的过程中，authcode()把用户的登录信息进行加密，因为没有加密的数据在传递过程中容易被截取，这样会暴露了用户的信息，authcode()的作用就是给传递的数据提供加密保护作用。在数据到达终端（UCenter）时authcode()再把加密的数据进行反向解密，还原数据。
通过下面的程序演示会让我们更了解authcode()以及同步登录的原理。
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