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27 lines
1.6 KiB
Markdown
27 lines
1.6 KiB
Markdown
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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architectural 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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