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关于codeigniter的索引结构

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Release： 2016-06-13 12:59:03
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关于codeigniter的目录结构
小弟目前在学习CI框架, 我发现里面application 和 system目录下面都有core , helpers, language, libraries这四个目录, 而appliction下的这几个目录差不多都是空的, 看了一下文档知道了,加载时是先从appliction下面找,如果没有就去system下面找. 
我不明白为什么还要在application下面加这几个目录呢?不显着累赘吗? 
------解决方案--------------------
这个是要你写扩展用的。 同名扩展会盖住核心类和库。

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