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23 lines
1.4 KiB
Markdown
23 lines
1.4 KiB
Markdown
Application Structure
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=====================
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> Note: This chapter is under development.
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Yii implements the model-view-controller (MVC) design pattern, which is
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widely adopted in Web and other application programming. MVC aims to separate business logic from
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user interface considerations, allowing developers to more easily change one component of an application without affecting, or even touching, another.
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In MVC, the *model* represents both the
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information (the data) and the business rules to which the data must adhere. The *view* contains elements
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of the user interface, such as text, images, and form elements. The *controller* manages
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the communication between the model and the view, acting as an agent that handles actions and requests.
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Besides implementing the MVC design pattern, Yii also introduces a *front-controller*, called
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*application*. The front-controller encapsulates the *execution context* for the processing of a request. This means that the front-controller collects information about a user request, and
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then dispatches it to an appropriate controller for the actual handling of that request. In other words, the front-controller is the primary application manager, handling all requests and delegating action accordingly.
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The following diagram shows the static structure of a Yii application:
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