Model-View-Controller
CodeIgniter is based on the Model-View-Controller development pattern. MVC is a software approach that separates application logic from presentation. In practice, it permits your web pages na contain minimal scripting since the presentation is separate from the PHP scripting.
- The Model represents your data structures. Typically your model classes will contain functions that help you retrieve, insert, and update information in your database.
- The View is the information that is being presented na a user. A View will normally be a web page, but in CodeIgniter, a view can also be a page fragment like a header nebo footer. It can also be an RSS page, or any other type of "page".
- The Controller serves as an intermediary between the Model, the View, and any other resources needed na process the HTTP request and generate a web page.
CodeIgniter has a fairly loose approach na MVC since Models are not required. If you don't need the added separation, nebo find that maintaining models requires more complexity than you want, you can ignore them and build your application minimally using Controllers and Views. CodeIgniter also enables you na incorporate your own existing scripts, nebo even develop core libraries for the system, enabling you na work in a way that makes the most sense to you.