Yii Framework Tutorial: Create a Complete Web Application

Yii framework is a fast, secure and efficient web application framework that is widely used in various web development projects. This article will introduce how to create a complete Yii framework web application.

Step 1: Install the Yii framework

Before we start creating the application, we need to install the Yii framework. The framework provides two installation methods, one is to use Composer, and the other is to download the release version of Yii. Here we introduce how to install the Yii framework using Composer.

First, you need to install Composer on your computer. Open a terminal window, enter the specified directory, and execute the following command:

composer create-project yiisoft/yii2-app-basic basic 2.0.1

This command will create a Yii application named "basic" and install the latest development version of the Yii framework (2.0.1) as a dependency into the application.

Step 2: Create the database

Before continuing, we need to create the database first. You can use any MySQL database management tool, such as phpMyAdmin, Navicat, etc. After creating the database, you need to specify the database connection in the configuration file of the Yii application.

The configuration file is located in the "config" directory of the Yii application and is named "db.php". Open the file and fill in the database configuration information, such as database user name, password, host address and database name:

return [
    'class' => 'yiidbConnection',
    'dsn' => 'mysql:host=localhost;dbname=mydatabase',
    'username' => 'myuser',
    'password' => 'mypassword',
    'charset' => 'utf8',
];

Step 3: Create the controller

In the Yii framework, the controller It is the main component in the application that handles requests and responses. We need to create a controller first and define some methods to handle requests. In the Yii framework, controllers are usually placed in the "controllers" directory. We create a controller named "SiteController" and define a method named "actionIndex" in the controller to handle requests for the home page.

<?php

namespace appcontrollers;

use Yii;
use yiiwebController;

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

Step 4: Create a view file

In the Yii framework, the view file is the main component for displaying data. We need to create a view file named "index" to render the content of the home page. View files are usually placed in the "views" directory. Create a file named "index.php" and render the content of Hello World in the file.

<h1 id="Hello-World">Hello World</h1>

Step 5: Configure routing

In the Yii framework, routing specifies how the application parses the request and assigns the request to the corresponding controller and action. We need to configure some routing rules to specify how to match controllers and actions through URLs. In the Yii framework, routing rules are usually placed in the "web.php" file in the "config" directory.

In this file, we can find the component named "urlManager" and add a new routing rule in its "rules" attribute:

return [
    'components' => [
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'rules' => [
                '/' => 'site/index',
            ],
        ],
    ],
];

The above rules will "/" The request is routed to the SiteController's actionIndex method.

Step Six: Run the Application

Now that we have created a complete Yii application, we can start the application and test whether it is working properly. We can use PHP's built-in web server to launch the application. Open a terminal window, enter the root directory of the Yii application, and enter the following command:

php yii serve

After executing this command, you can enter "http://localhost:8080" in the browser to access the homepage of the application .

Summary

At this point, we have successfully created a complete Yii application. Through this tutorial, you have mastered how to install the Yii framework, create databases, controllers, view files and routing rules. I hope this article helps you and allows you to easily create an efficient, fast, and secure web application.

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