修改方法：

打开 includes/lib_goods.php文件找到
$arr[$i]['price'] = price_format($arr[$i]['shop_price']);

把它修改为下面代码即可

$arr[$i]['price'] = price_format($GLOBALS['db']->getOne("select if NULL(mp.user_price, d.shop_price * '$_SESSION[discount]') as price from ".$GLOBALS['ecs']->table['goods']."as d left join".$GLOBALS['ecs']->table('member_price')." as mp on mp.goods_id = d.goods_id and mp.user_rank = '$_SESSION[user_rank]' where d.goods_id = ".$arr[$i]['goods_id']));