PHP is a widely used programming language that can be used to develop web applications. Yii framework is a high-performance framework based on PHP, which is widely used in the development of web applications. This article will introduce the basic knowledge of Yii framework to beginners so that they can get started better.

1. What is the Yii framework?

Yii framework is a high-performance web application framework based on PHP. It provides many useful functions and components to make web application development faster and more efficient. The Yii framework has the characteristics of good security, easy scalability, ease of use, and high performance, and is deeply loved by PHP developers and enterprise users.

2. Advantages of Yii Framework

If you are considering using Yii Framework to develop your web applications, here are some Yii Framework advantages:

High performance: Yii framework is a high-performance web application framework that supports workload balancing and caching, which can greatly improve the performance of web applications.

Easy to expand: Yii framework supports plug-in architecture, developers can easily add or remove components to meet different needs.

Easy to use: The Yii framework is simple to operate, easy to learn and easy to use, which can greatly save developers' time and energy.

Good security: The security of Yii framework is comparable to strict financial standards, providing strict security mechanisms to make web applications more secure and reliable.

3. Basic concepts of Yii framework

Before learning the Yii framework, it is very important to understand its basic concepts. The following are some common concepts in the Yii framework:

MVC architecture: MVC is a mainstream web application development model, where M stands for model, V stands for view, and C stands for controller. The Yii framework is based on the MVC architecture, making developing web applications more efficient and reliable.

Router: The router function in the Yii framework can convert user requests into corresponding MVC components.

Controller: A controller in the Yii framework is a class that handles user requests and controls how to respond to the requests.

Model: The model in the Yii framework is the component responsible for processing data. It provides many useful functions to simplify and optimize database operations.

View: A view is what users see when they access a web application. The Yii framework supports a variety of view templates, including PHP, Twig, Smarty, etc.

Components: Components are the infrastructure in the Yii framework. They are used to encapsulate some public functions for use by the entire application.

4. Installation of Yii framework

Yii framework installation is very simple and can be installed through Composer or manually. Assuming you have installed Composer, open the terminal and enter the following command:

composer create-project --prefer-dist yiisoft/yii2-app-basic my-project

After running , installed Yii2 into the my-project directory.

5. Basic usage of Yii framework

This section will introduce some basic usage of Yii framework, including creating controllers, generating models and views.

5.1 Create a controller

The controller in the Yii framework is a class that handles user requests. The following is a simple controller code example:

render('index');
    }
}

In the above In the example, we define a controller class SiteController, which extends from the Controller class of the Yii framework. There is a public method actionIndex() in this class, which handles user requests and renders the view file index.php.

5.2 Generate model

The model in the Yii framework is a class used to manage data. Here is an example:

In the above example, we define a User Class, which extends from the ActiveRecord class of the Yii framework. ActiveRecord is a simple but powerful ORM (Object Relational Mapping) framework that provides basic support for models in the Yii framework. 
5.3 Generate View
The view is what the user sees when they access the web application. Here is a simple view code example: 
Hello, 
In the above example, we A simple page is written using PHP markup which contains an 4a249f0d628e2318394fd9b75b4636b1 title and a $name variable which will be displayed in the page. 
Summary
Yii framework is a high-performance framework based on PHP for developing web applications. This article introduces the basic knowledge of the Yii framework, including what is the Yii framework, the advantages of the Yii framework, the basic concepts of the Yii framework, the installation of the Yii framework, and the basic usage of the Yii framework. I hope this article can help beginners better understand the Yii framework and get started quickly. 
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