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25 lines
1.4 KiB
Markdown
25 lines
1.4 KiB
Markdown
Overview
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========
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Each time when a Yii application handles a request, it undergoes a similar workflow.
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1. A user makes a request to the [entry script](structure-entry-scripts.md) `web/index.php`.
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2. The entry script loads the application [configuration](concept-configurations.md) and creates
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an [application](structure-applications.md) instance to handle the request.
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3. The application resolves the requested [route](runtime-routing.md) with the help of
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the [request](runtime-requests.md) application component.
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4. The application creates a [controller](structure-controllers.md) instance to handle the request.
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5. The controller creates an [action](structure-controllers.md) instance and performs the filters for the action.
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6. If any [filter](structure-filters.md) fails, the action is cancelled.
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7. If all filters pass, the action is executed.
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8. The action loads a data [model](structure-models.md), possibly from a database.
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9. The action renders a [view](structure-views.md), providing it with the data model.
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10. The rendered result is returned to the [response](runtime-responses.md) application component.
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11. The response component sends the rendered result to the user's browser.
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The following diagram shows how an application handles a request.
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In this section, we will describe in detail how some of these steps work.
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