...
 "require": {
  ...
  "illuminate/validation": "^5.8",
...

namespace app\common;

use Illuminate\Filesystem\Filesystem;
use Illuminate\Translation\FileLoader;
use Illuminate\Translation\Translator;
use Illuminate\Validation\Factory;

class Validator
{
 private static $instance = null;

 private function __construct()
 {
 }

 public static function getInstance(): Factory
 {
 if (null === static::$instance) {
  $translationPath = get_alias('@assets/lang');
  $translationLocale = 'zh-CN';
  $transFileLoader = new FileLoader(new Filesystem(), $translationPath);
  $translator = new Translator($transFileLoader, $translationLocale);
  static::$instance = new Factory($translator);
 }

 return static::$instance;
 }
}

// https://learnku.com/docs/laravel/5.8/validation/3899#manually-creating-validators
// $rules = [
// 'name' => 'required|string|min:2|max:5',
// 'code' => 'required|string|min:2|max:5',
// ];
function validator(array $data, array $rules, array $messages = [], array $customAttributes = [])
{
 return \app\common\Validator::getInstance()->make($data, $rules, $messages, $customAttributes);
}

$rules = ['name' => 'required|numeric'];
$customAttributes = ['name' => 'My name'];
$messages = ['name.required' => 'A name is required',];

$validator = validator($data, $rules, $customAttributes, $messages);
if ($validator->fails()) {
 $errors = $validator->errors()->all();
 Response::error(Errors::ParamsInvalid, implode(',', $errors), $errors);
}