Qiang Xue
10 years ago
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Overview |
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======== |
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Yii applications are organized according to the [model-view-controller (MVC)](http://wikipedia.org/wiki/Model-view-controller) |
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design pattern. [Models](structure-models.md) represent data, business logic and rules; [views](structure-views.md) |
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are output representation of models; and [controllers](structure-controllers.md) take input and convert |
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it to commands for [models](structure-models.md) and [views](structure-views.md). |
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Besides MVC, Yii applications also have the following entities: |
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* [entry scripts](structure-entry-scripts.md): they are PHP scripts that are directly accessible by end users. |
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They are responsible for starting a request handling cycle. |
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* [applications](structure-applications.md): they are globally accessible objects that manage application components |
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and coordinate them to fulfill requests. |
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* [application components](structure-application-components.md): they are objects registered with applications and |
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provide various services for fulfilling requests. |
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* [modules](structure-modules.md): they are self-contained packages that contain complete MVC by themselves. |
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An application can be organized in terms of multiple modules. |
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* [filters](structure-filters.md): they represent code that need to be invoked before and after the actual |
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handling of each request by controllers. |
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* [widgets](structure-widgets.md): they are objects that can be embedded in [views](structure-views.md). They |
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may contain controller logic and can be reused in different views. |
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The following diagram shows the static structure of an application: |
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![Static Structure of Application](images/application-structure.png) |
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