Yii framework middleware: achieving multi-language and internationalization support

Yii framework middleware: achieving multi-language and international support

Introduction:
In today's globalized Internet era, achieving multi-language and international support is a very important requirement. Whether it is an enterprise-level website or a personal blog, the language needs of different regions and users need to be taken into consideration. The Yii framework provides a simple and efficient way to implement multi-language and internationalization support by using middleware.

1. Understanding Yii Framework Middleware
Middleware is a logical layer used for processing between requests and responses. In the Yii framework, middleware can be used to implement various functions, such as permission verification, identity authentication, etc. At the same time, we can also use middleware to complete multi-language and internationalization functions.

2. Create multi-language and international middleware
Let’s create a simple multi-language and international middleware. First, we need to create a folder named "middlewares" in the Yii project's directory, and then create a file named "languageMiddleware.php" in that folder. In this file we can implement multilingual and internationalization logic.

<?php
namespace appmiddlewares;
use Yii;

class LanguageMiddleware
{
    public function handle($request, $next)
    {
        // 获取用户的语言设置
        $language = $request->get('language');

        // 根据用户的语言设置，设置Yii框架的语言
        if($language){
            Yii::$app->language = $language;
        }

        return $next($request);
    }
}

In the above code, we define a middleware class named "LanguageMiddleware". In the "handle" method, we first get the user's language settings, and then set the language of the Yii framework according to the user's language settings.

3. Register middleware
Next, we need to register the middleware we created into the Yii framework. In the configuration file of the Yii framework (usually "config/web.php"), find the "components" option, and then add the following configuration:

'components' => [
    // ...
    'request' => [
        'class' => 'yiiwebRequest',
        'middlewares' => [
            [
                'class' => 'appmiddlewaresLanguageMiddleware',
            ],
        ],
    ],
    // ...
],

In the above code, we are in the configuration of the "request" component Added the "middlewares" option and configured the middleware we created into it.

4. Using middleware
Now that we have completed the creation and registration of middleware, let's take a look at how to use middleware in the controller to achieve multi-language and internationalization functions. Still in the configuration file (usually "config/web.php"), find the "components" option, and then add the following configuration:

'components' => [
    // ...
    'controller' => [
        'on beforeAction' => function($event){
            // 获取用户设置的语言
            $language = Yii::$app->request->get('language');

            // 设置默认语言为英语
            if(!$language){
                $language = 'en-US';
            }

            // 设置Yii框架的语言
            Yii::$app->language = $language;
        }
    ],
    // ...
],

In the above code, we use The "on beforeAction" event is added, which will be called before each controller is executed. In this event, we first get the language set by the user, and then set the language of the Yii framework.

5. Summary
Through the above steps, we successfully created a middleware and registered it in the Yii framework. By using middleware, it becomes very easy to achieve multi-language and international support in different regions and different users. I hope this article will help you understand the use of Yii framework middleware and implement multi-language and internationalization support.

References:
[1] Yii2 Guide - Middleware, https://www.yiiframework.com/doc/guide/2.0/en/runtime-middleware

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