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mvc-php类中有些方法只有方法名，没写内容

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Release： 2016-06-02 11:33:42
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phpmvc

一般都是MVC比较底层的类里会出现这种方法，搞不清楚这个事干嘛用的。是为了覆盖方法吗？还是只做定义用？

public function isRegistered($userId);

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