### 计算订单单品实收金额
**位置:**
Common\Lib\OrderLib.class.php
**参数:**
* @param $pay_amount 订单实收总金额
* @param $ac_price 单品销售金额
* @param $ac_total 订单销售金额总和(可以用订单应收总金额+活动优惠金额算出)
**调用:**
* 组件文件外调用
// 计算订单单品实收金额
$my_order = new OrdersLib();
$item_data['payin_amount'] = $my_order->calculatePayinAmount($order_data['pay_amount'], $vv['ac_price'], $ac_total);
**返回:**
订单单品实收金额
**完整代码:**
~~~
/**
* 计算订单单品实收金额
* @param $pay_amount 订单实收总金额
* @param $ac_price 单品销售金额
* @param $ac_total 订单销售金额总和(可以用订单应收总金额+活动优惠金额算出)
* @return float
*/
public function calculatePayinAmount($pay_amount, $ac_price, $ac_total) {
// 每个唯一码的实收金额计算,实收总金额 * 销售金额/销售金额之和(均摊优惠)
$payin_amount = $pay_amount * ($ac_price/$ac_total);
return round($payin_amount, 2);
}
~~~
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