In Laravel applications, processing text content in different languages ​​and regions is a very important function. By default, Laravel specifies the application's default locale using the locale option in the config/app.php configuration file. However, in some cases, we may need to dynamically change the locale of the application at runtime. This article will explain how to dynamically change the locale of your application in Laravel.

Step 1: Set up locale routing

First, we need to create a route to handle locale changes. In Laravel, we can use the following routing code block to achieve this:

Route::get('language/{locale}', function ($locale) {
    session(['locale' => $locale]);
    return redirect()->back();
});

The above code block will create a route named "language" which contains a parameter named "locale". When a route matches, we store the user's selected locale in the session and redirect the user back to the previous page.

Step 2: Create locale middleware

Next, we need to create a middleware to ensure that the application runs correctly in different locales. In Laravel, we can create a middleware called "LocaleMiddleware" using the following code block:

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Session;

class LocaleMiddleware
{
    public function handle($request, Closure $next)
    {
        $locale = Session::get(&#39;locale&#39;, config(&#39;app.locale&#39;));

        App::setLocale($locale);

        return $next($request);
    }
}

In the above code block, we use the Session Facade to get the locale selected by the user, if the locale is not set in the session , the default locale in the config/app.php configuration file is used. Once we determine the locale, we dynamically set the current locale in the application.

Step 3: Add the middleware to the application

Next, we need to add the middleware to the Laravel application to ensure it is used appropriately in the request pipeline. We can add middleware to our Laravel application using the following steps:

1. In the app/Http/Kernel.php file, add the following lines to the $routeMiddleware array:

'locale' => \App\Http\Middleware\LocaleMiddleware::class,

2. In your application routes file, add the "locale" middleware to any routes that need to take locale into account. For example:

Route::get('/', function () {
    return view('welcome');
})->middleware(['locale']);

This will ensure that in this route, the middleware will be used to set the locale at runtime.

Step 4: Test the Application

Now that we have a route set up to handle locale changes and a middleware to ensure the correct locale is used throughout the application, then How do we test the application?

1. First, open the website and select a language in the app.
2. Then, try to access other routes or pages in the application and confirm that the text content has been updated to reflect the selected locale.
3. Finally, the application's locale can be changed via URL parameters by going to the "/language/[locale]" route, ensuring that the text content after the locale change is updated correctly.

Conclusion

In this article, we covered how to dynamically change the locale of an application in Laravel. By setting up routing and middleware to handle locale changes, we ensure that the selected locale is used correctly throughout the application. This is a very useful feature that helps you automate the localization of your site based on specific user preferences, thereby improving user experience.

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