ecshop计算各种价格函数
function get_final_price($goods_id, $goods_num = '1', $is_spec_price = false, $spec = array()) {
$final_price = '0'; //商品最终购买价格
$volume_price = '0'; //商品优惠价格
$promote_price = '0'; //商品促销价格
$user_price = '0'; //商品会员价格
//取得商品优惠价格列表
$price_list = get_volume_price_list($goods_id, '1');
if (!empty($price_list))
{
foreach ($price_list as $value)
{
if ($goods_num >= $value['number'])
{
$volume_price = $value['price'];
}
}
}
//取得商品促销价格列表
/* 取得商品信息 */
$sql = "SELECT g.promote_price, g.promote_start_date, g.promote_end_date, ".
"IFNULL(er_price, g.shop_price * '" . $_SESSION['discount'] . "') AS shop_price ".
" FROM " .$GLOBALS['ecs']->table('goods'). " AS g ".
" LEFT JOIN " . $GLOBALS['ecs']->table('member_price') . " AS mp ".
"ON mp.goods_id = g.goods_id AND er_rank = '" . $_SESSION['user_rank']. "' ".
" WHERE g.goods_id = '" . $goods_id . "'" .
" AND g.is_delete = 0";
$goods = $GLOBALS['db']->getRow($sql);
/* 计算商品的促销价格 */
if ($goods['promote_price'] > 0)
{
$promote_price = bargain_price($goods['promote_price'], $goods['promote_start_date'], $goods['promote_end_date']);
}
else
{
$promote_price = 0;
}
//取得商品会员价格列表
$user_price = $goods['shop_price'];
//比较商品的促销价格，会员价格，优惠价格
if (empty($volume_price) && empty($promote_price))
{
//如果优惠价格，促销价格都为空则取会员价格
$final_price = $user_price;
}
elseif (!empty($volume_price) && empty($promote_price))
{
//如果优惠价格为空时不参加这个比较。
$final_price = min($volume_price, $user_price);
}
elseif (empty($volume_price) && !empty($promote_price))
{
//如果促销价格为空时不参加这个比较。
$final_price = min($promote_price, $user_price);
}
elseif (!empty($volume_price) && !empty($promote_price))
{
//取促销价格，会员价格，优惠价格最小值
$final_price = min($volume_price, $promote_price, $user_price); }
else
{
$final_price = $user_price;
}
//如果需要加入规格价格
if ($is_spec_price)
{
if (!empty($spec))
{
$spec_price = spec_price($spec);
$final_price += $spec_price;
}
}
//返回商品最终购买价格 return $final_price; }
