cxinv/app/admin/model/InvoiceInfo.php

<?php
declare (strict_types = 1);

namespace app\admin\model;

use think\Model;

/**
 * @mixin \think\Model
 */
class InvoiceInfo extends Model
{
    public static function OnAfterWrite(Model $model){
       if($model->status==1 && !empty($model->item)){
          (new  InvoiceItem)->saveAll(array_map(function ($item)use($model) {
              return [
                  'invoice_code'=>$model->hpNo,
                  'order_type'=>2,
                  'good_name'=>$item['name'],
                  'unit'=>$item['unit'],
                  'num'=>$item['quantity'],
                  'unit_price'=>$item['unit_price'],
                  'amount'=>$item['amount'],
                  'tax_amount'=>$item['tax'],
                  'tax'=>$item['tax_rate'],
                  'cat_code'=>$item['license_plate_number'],
                  'total_amount'=>bcadd($item['amount'],$item['tax'],2),
                  'balance_amount'=>bcadd($item['amount'],$item['tax'],2),
              ];
          },$model->item));
       }
   }
}