public_producer/app/Constants/ErrorCode.php

<?php
declare(strict_types=1);
namespace App\Constants;
use Hyperf\Constants\AbstractConstants;
use Hyperf\Constants\Annotation\Constants;
/**
 * @Constants
 */
#[Constants]
class ErrorCode extends AbstractConstants
{
    /**
     * @Message("Server Error！")
     */
    const SERVER_ERROR = 500;
    /**
     * @Message("success")
     */
    public const SUCCESS = 200;
    /**
     * @Message("error")
     */
    public const ERROR = 0;
}