With the continuous development of the Internet, the demand for web application development is also getting higher and higher. For developers, developing applications requires a stable, efficient, and powerful framework, which can improve development efficiency. Yii is a leading high-performance PHP framework that provides rich features and good performance. Yii3 is the next generation version of the Yii framework, which further optimizes performance and code quality based on Yii2. In this article, we will introduce how to use Yii3 framework to develop PHP applications.

1. Install the Yii3 framework

The Yii3 framework is installed using Composer. Create a composer.json file in your project and add the dependencies as follows:

{
  "require": {
    "yiisoft/yii-core": "^3.0@dev"
  }
}

Then run composer install in the command line to install the Yii3 framework.

2. Create Application

With the help of yii3’s console tool (box), we can quickly create a Yii3 application that can be run in the command line The following command:

./vendor/bin/yii app/init

This will prompt you for information such as the configuration and name of the application and create a basic Yii3 application architecture. The Yii3 application directory structure is as follows:

app/
    assets/
    commands/
    config/
    controllers/
    runtime/
    test/
    views/
    web/
    Application.php
    app.json
    yii
vendor/
    yiisoft/
htdocs/
    index.php

Among them, the app/ directory contains the source code and configuration files of the application, the vendor/ directory contains the dependent libraries of the Yii3 framework, and the htdocs/ directory contains the entry files of the Web application and static files.

3. Creating controllers and actions

In Yii3, the controller class inherits from the yiiwebController class. You can define action methods in the controller class to handle requests, for example:

namespace appcontrollers;

use yiiwebController;

class SiteController extends Controller
{
    public function actionIndex()
    {
        return $this->render('index');
    }

    public function actionAbout()
    {
        return $this->render('about', [
            'message' => 'This is the About page.',
        ]);
    }
}

The above code defines a SiteController class, which contains two action methods: actionIndex() and actionAbout(). These methods return the contents of the view file.

4. Create Views

In Yii3, view files are contained in a directory and can be rendered through a controller's action method. For example:

namespace appcontrollers;

use yiiwebController;

class SiteController extends Controller
{
    public function actionIndex()
    {
        return $this->render('index');
    }

    public function actionAbout()
    {
        return $this->render('about', [
            'message' => 'This is the About page.',
        ]);
    }
}

This will render the page content in the views/site/index.php view file.

5. Configuring routing

The routing of the Yii3 framework can specify the mapping relationship between the request URL and the corresponding controller/action handler. By default, Yii3's routing rules are located in the app/config/routes.php file. For example:

return [
    '/' => 'site/index',
    '/about' => 'site/about',
];

The above code specifies two routing rules, where / and /about correspond to the Index() and About() methods of the SiteController class respectively.

6. Running Yii3 Application

Before starting the web application, you need to configure the web server to automatically point to the entry file (such as index.php). Before deploying the web application to the web server, you can run the Yii3 application using the built-in web server on your local computer. You can run the following command in the command line:

./vendor/bin/yii serve/start

This will start the built-in web server and start the Yii3 application. You can then visit http://localhost:8080 in your browser to view your application.

Summary

The above are the basic steps for developing PHP applications using the Yii3 framework. The Yii3 framework provides developers with powerful tools to build high-performance and stable web applications. Using the Yii3 framework, you can easily create a highly scalable and customizable application. If you want to learn more about the Yii3 framework, it is recommended that you refer to the official documentation, which will provide you with a deeper understanding and knowledge.

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