Core components of Yii framework

The Yii framework is a high-performance, highly customizable, object-oriented PHP development framework that is widely used in the development of Web applications. In the Yii framework, there are many core components that provide developers with convenient and fast solutions. This article will introduce the core components of Yii framework.

1. Controller

The controller of the Yii framework is the core component for processing requests. The controller is responsible for receiving requests, calling the model to perform data operations, and returning the results to the view for display. An important feature of the controller is that it supports RESTful routing. Different controller method calls can be implemented through the HTTP request method in the URL. This feature is very helpful for developing RESTful interfaces.

2. Model

The model of the Yii framework is the core component for processing data. The model is responsible for adding, deleting, modifying, and querying operations on the database, and can also perform data verification and formatting. The model of Yii framework supports Active Record and Data Access Object (DAO). Active Record mode is a way to quickly build models, while DAO mode is more flexible and suitable for handling complex data operation scenarios.

3. View

The view of the Yii framework is the core component for displaying data. The view is responsible for displaying the data returned by the model to the user, and is responsible for responding to the user's interactive behavior, such as submitting a form, etc. The views of the Yii framework support multiple rendering methods, including PHP, HTML, JSON, etc. You can choose different rendering methods in different scenarios.

4. Routing

The routing of the Yii framework is the core component of parsing URLs. Routing is responsible for routing HTTP requests to the corresponding controllers and methods, and also supports functions such as RESTful routing and URL redirection. The routing of Yii framework is very flexible, and routing rules can be customized according to the needs of the application.

5. Database (DB)

The database component of the Yii framework is the core component for operating the database. The database component supports a variety of database connection methods, including common databases such as MySQL, PostgreSQL, and SQLite. It also supports high-availability configurations such as master-slave separation and read-write separation. When using database components, you can use QueryBuilder to build query statements. QueryBuilder supports fluent API calling methods, making the writing of query statements more concise and clear.

6. Form

The form component of the Yii framework is the core component for processing form data. The form component is responsible for handling operations such as validation and formatting of the form, and also supports actions such as adding and deleting fields in the form. The form component of the Yii framework is very flexible and can be used for form operations in different scenarios.

7. RESTful

The RESTful extension of Yii framework is the core component for building RESTful interfaces. The RESTful extension supports the mapping of HTTP request methods, which can easily implement different resources corresponding to different request methods. At the same time, the RESTful extension supports the parsing of request parameters and the formatting of response data, making it easier for developers to build efficient RESTful interfaces.

The above are the main core components of the Yii framework, and there are many other extension components, including caching, authentication, RBAC, etc. These components provide powerful support for the application development of the Yii framework. Mastering the use of these core components allows developers to develop high-quality Yii applications more efficiently.

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