Laravel-Manual-Multilangual

1/ create 2 middleware
<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;

class LanguageManager
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure(\Illuminate\Http\Request): (\Illuminate\Http\Response|\Illuminate\Http\RedirectResponse)  $next
     * @return \Illuminate\Http\Response|\Illuminate\Http\RedirectResponse
     */
    public function handle(Request $request, Closure $next)
    {
        if (session()->has('locale')) {
            App::setLocale(session()->get('locale'));
        }

        return $next($request);
    }
}
====================
<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;

class SetLocale
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure(\Illuminate\Http\Request): (\Illuminate\Http\Response|\Illuminate\Http\RedirectResponse)  $next
     * @return \Illuminate\Http\Response|\Illuminate\Http\RedirectResponse
     */
    public function handle(Request $request, Closure $next)
    {

        $locale = session('locale', config('app.locale'));
        App::setLocale($locale);

        return $next($request);
    }
}
==================
2/ register to karnel
  protected $middleware = [
        \App\Http\Middleware\SetLocale::class,
    ];

    /**
     * The application's route middleware groups.
     *
     * @var array<string, array<int, class-string|string>>
     */
    protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\LanguageManager::class,
        ],


    ];
============================
3/ create Route
Route::get('/setlocale/{locale}', [LandingPageController::class, 'setLocale'])->name('setlocale');
==============
4/ Controller

    public function setLocale(Request $request, $locale)
    {
        App::setLocale($locale);
        session()->put('locale', $locale);

        return back();
    }
=============
5/ change language 
  <div style="text-align: right;">
                <form id="language-form" action="{{ route('setlocale', ['locale' => '__locale__']) }}" method="GET">
                    @csrf
                    <select name="locale" onchange="changeLocale(this.value)">
                        <option value="en" @if (app()->getLocale() == 'en') selected @endif>🇺🇸 English
                        </option>
                        <option value="fr" @if (app()->getLocale() == 'fr') selected @endif>🇫🇷 French
                        </option>
                        <option value="es" @if (app()->getLocale() == 'es') selected @endif>🇪🇸 Spanish
                        </option>
                    </select>
                </form>
            </div>
=========================
6/ form submit js


function changeLocale(locale) {
    var form = document.getElementById("language-form");
    form.action = form.action.replace("__locale__", locale);
    form.submit();
}