red/application/admin/model/WechatPlan.php

<?php

namespace app\admin\model;

use think\Model;

class WechatPlan extends Model
{

    // 自动写入时间戳字段
    protected $autoWriteTimestamp = 'int';
    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';

    public static function getNewCode()
    {
        do {
            list($msec, $sec) = explode(' ', microtime());
            $msectime = number_format((floatval($msec) + floatval($sec)) * 1000, 0, '', '');
            $orderId = 'qy' . $msectime . mt_rand(10000, 99999);
        } while (self::where(['order_id' => $orderId])->find());
        return $orderId;
    }
}