ss-visit/app/Http/Middleware/SetLocale.php

<?php

namespace App\Http\Middleware;

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

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)
    {
        // 支持的语言列表
        $supportedLocales = ['zh_CN', 'en'];

        // 只从header头获取语言设置
        $locale = $request->header('Accept-Language') ?? config('app.locale', 'zh_CN');

        // 验证语言是否支持
        if (in_array($locale, $supportedLocales)) {
            App::setLocale($locale);
        } else {
            // 如果语言不支持，使用默认语言
            App::setLocale('zh_CN');
        }

        return $next($request);
    }
}