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 to 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 to a user. A View will normally be a web page, but in CodeIgniter, a view can also be a page fragment like a header or 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 to process the HTTP request and generate a web page.

CodeIgniter has a fairly loose approach to MVC since Models are not required. If you don’t need the added separation, or 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 to incorporate your own existing scripts, or even develop core libraries for the system, enabling you to work in a way that makes the most sense to you.
  • 模型 包含与您的数据库和其他数据结构相关的所有代码。如果您具有一个名为 pages 的表,则您具有一个模型,其中具有用于从表中选择、创建、更新和删除记录的函数。
  • 视图 包含所有显示和 UI 元素 — JavaScript 代码、Cascading Style Sheets (CSS)、HTML 甚至 PHP。
  • 控制器 将一切联系在一起。控制器中的每个函数表示一个目的地或路线。如果您具有一个名为 /about 的目的地,则控制器将具有一个名为 about() 的函数。


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