，你只是把两个类放在同一个MY_Model文件中。此文件用作codeigniter的自动加载功能的一部分，这意味着它将查找具有MY_（或config defined）前缀的任何文件。

As I said in this question about the controllers you just put both classes in the same MY_Model file. This file is used as part of the autoload feature of codeigniter, meaning that it will look for any files with the MY_ (or config defined) prefix.

甚至需要调用MY_Model里面的类，你可以调用它MY_Special_Model，并在下面有MY_Another_Model

You don't even need to call the class inside MY_Model you can potentially call it MY_Special_Model and have MY_Another_Model directly underneath