Php 计算折扣和数量函数中的新价格

我试图开发一个函数，允许计算数量折扣函数中的特定价格

示例：数据库函数中的10%=

$discount\u customer[]

$qty

由用户添加

如果$qty<5，则$$折扣\u客户[]=0

：价格不变

如果$qty>5 et qty<10，则$$折扣\u客户[]=10%

：价格为-10%

如果$qty>10，则$$折扣\客户[]=15%

：价格为-15%

$id

：产品的id

public function getProductsNewPriceByDiscountQuantity($id, $qty, $products_price) {
  $OSCOM_Db = Registry::get('Db');
  $OSCOM_Customer = Registry::get('Customer');

  $QprodutsQuantityDiscount= $OSCOM_Db->prepare('select discount_quantity, 
                                                        discount_customer
                                                  from :table_products_discount_quantity
                                                  where products_id = :products_id
                                                  and customers_group_id = :customers_group_id
                                                  and discount_quantity <> 0
                                                ');
  $QprodutsQuantityDiscount->bindInt(':products_id', (int)$id );
  $QprodutsQuantityDiscount->bindInt(':customers_group_id', $OSCOM_Customer->getCustomersGroupID());

  $QprodutsQuantityDiscount->execute();

  while ($QprodutsQuantityDiscount->fetch()) {

// quantity discount
        $discount_quantity[] = $QprodutsQuantityDiscount->valueInt('discount_quantity');

// Customer discount
        $discount_customer[] = $QprodutsQuantityDiscount->valueDecimal('discount_customer');
      }

$qty

：客户插入的订单数量

$products\u price

：产品的价格

public function getProductsNewPriceByDiscountQuantity($id, $qty, $products_price) {
  $OSCOM_Db = Registry::get('Db');
  $OSCOM_Customer = Registry::get('Customer');

  $QprodutsQuantityDiscount= $OSCOM_Db->prepare('select discount_quantity, 
                                                        discount_customer
                                                  from :table_products_discount_quantity
                                                  where products_id = :products_id
                                                  and customers_group_id = :customers_group_id
                                                  and discount_quantity <> 0
                                                ');
  $QprodutsQuantityDiscount->bindInt(':products_id', (int)$id );
  $QprodutsQuantityDiscount->bindInt(':customers_group_id', $OSCOM_Customer->getCustomersGroupID());

  $QprodutsQuantityDiscount->execute();

  while ($QprodutsQuantityDiscount->fetch()) {

// quantity discount
        $discount_quantity[] = $QprodutsQuantityDiscount->valueInt('discount_quantity');

// Customer discount
        $discount_customer[] = $QprodutsQuantityDiscount->valueDecimal('discount_customer');
      }

谢谢您

公共函数getProductsNewPriceByDiscountQuantity（$id，$qty，$products\U price）{
$OSCOM_Db=Registry:：get（'Db'）；
$OSCOM_Customer=Registry:：get（'Customer'）；
$QprodutsQuantityDiscount=$OSCOM\u Db->prepare（'选择折扣\u数量，
顾客折扣
来源：表\产品\折扣\数量
其中products\u id=：products\u id
客户组id=：客户组id
折扣数量为0
');
$QprodutsQuantityDiscount->bindInt（“：products_id”，（int）$id）；
$QprodutsQuantityDiscount->bindInt（':customers\u group\u id'，$OSCOM\u Customer->GetCustomerGroupID（））；
$Qprodutsquantity折扣->执行（）；
而（$QprodutsQuantityDiscount->fetch（））{
$折扣\数量[]=$QprodutsQuantityDiscount->valueInt（“折扣\数量”）；
$discount\u customer[]=$QprodutsQuantityDiscount->valueDecimal（'discount\u customer'）；
}
返回$this->getprct折扣（$qty，$products\u price）；
}
公共函数GetPrcTprice（$qty，$products\U价格）
{
$折扣=0；
如果（$qty>5&$qty<10）{
$折扣=10；
}其他（数量>10）{
$折扣=15；
}
$newPrice=$折扣>0
？$产品价格-（$产品价格*（$折扣/100））
：$newPrice；
返回$newPrice；
}

所以。。。我们应该为您编写这个函数吗？或者什么…？我试过了，你可以看到一个例子，但我不知道如何管理计算之间的间隔上次的

$newPrice

如果应该是

$products\u price

 return $newprice
    }

public function getProductsNewPriceByDiscountQuantity($id, $qty, $products_price) {
    $OSCOM_Db = Registry::get('Db');
    $OSCOM_Customer = Registry::get('Customer');

    $QprodutsQuantityDiscount= $OSCOM_Db->prepare('select discount_quantity, 
                                                          discount_customer
                                                    from :table_products_discount_quantity
                                                    where products_id = :products_id
                                                    and customers_group_id = :customers_group_id
                                                    and discount_quantity <> 0
                                                  ');
    $QprodutsQuantityDiscount->bindInt(':products_id', (int)$id );
    $QprodutsQuantityDiscount->bindInt(':customers_group_id', $OSCOM_Customer->getCustomersGroupID());

    $QprodutsQuantityDiscount->execute();

    while ($QprodutsQuantityDiscount->fetch()) {
      $discount_quantity[] = $QprodutsQuantityDiscount->valueInt('discount_quantity');
      $discount_customer[] = $QprodutsQuantityDiscount->valueDecimal('discount_customer');
    }

    return $this->getPrctDiscount($qty, $products_price);
}

public function getPrctDiscount($qty, $products_price)
    {
          $discount = 0;
          if ($qty > 5 && $qty < 10) {
            $discount = 10;
          }elseif ($qty > 10) {
            $discount = 15;
          }

          $newPrice = $discount > 0 
            ? $products_price - ($products_price * ($discount/100))
            : $newPrice;

          return $newPrice;
    }