Summary
The MVC pattern is a widely used and is a very effective way of organizing a complex website. CI uses it to help you sort your own code, but it is also fairly flexible about how it does so.
The crucial thing is to understand what the different type of files are, and how they relate to each other. Then, you can decide whether to write your code in library or model files, or as helpers or plugins.
We've looked at the CI file structure, and seen how you can, if you want, inspect all the CI code, but (thankfully!) you don't have to. We did tinker with one of the original files—the config file, which holds critical site information in one place to make it easy for us to upgrade or change later.
We've seen the basic object structure of a controller, ...
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