【PRO1.2】订单商品实际优惠优惠金额计算

 $integral_price = bcmul((string)bcdiv((string)$cart['truePrice'], (string)$total_price, 4), (string)$priceData['deduction_price'], 2);

 $coupon_price = bcmul((string)bcdiv((string)$cart['truePrice'], (string)$total_price, 4), (string)$couponInfo['coupon_price'], 2);

 $coupon_price = bcmul((string)bcdiv((string)$cart['truePrice'], (string)$total_price, 4), (string)$couponInfo['coupon_price'], 2);

} else {
                                    $coupon_price = 0;

 if (isset($cart['product_id']) && in_array($cart['product_id'], explode(',', $couponInfo['product_id']))) {

 $coupon_price = bcmul((string)bcdiv((string)$cart['truePrice'], (string)$total_price, 4), (string)$couponInfo['coupon_price'], 2);

} else {
                                $coupon_price = 0;