mtb_dcatadmin_plus/app/Admin/Controllers/LanguageController.php

<?php
namespace App\Admin\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
class LanguageController extends Controller
{

    public function index(Request $request)
    {
        return $this->switchLanguage($request);
    }

    /**
     * 切换语言并修改 app.locale
     *
     * @param Request $request
     * @return \Illuminate\Http\RedirectResponse
     */
    public function switchLanguage(Request $request)
    {
        // 从 URL 参数中获取语言，默认为 'en'
        $lang = $request->input('lang', 'en');

        // 验证是否是支持的语言
        if (!in_array($lang, ['en', 'zh_CN'])) {
            return redirect()->back()->withErrors(['error' => '不支持的语言']);
        }

        $configArray = ['lang' => $lang,];

        user_admin_config($configArray);

        // 动态修改 app.locale 配置
        config(['app.locale' => $lang]);

//        // 返回重定向或其他操作
//        return redirect()->back()->with('success', '语言已切换为: ' . $lang);
        return redirect('/prime-control');
    }

}