screen/application/common/model/UserTax.php

<?php

namespace app\common\model;

use think\Model;


class UserTax extends Model
{
    protected $type=[
        'tax'=>'json',
    ];

    public static function fromOrder(Orders $orders){
        if($orders['tax']){
            self::create([
                'user_id'=>$orders['user_id'],
                'tax'=>$orders['tax'],
            ]);
        }
    }
}