订单结算submit

<?php    header("content-type: text/html; chart=utf-8");    ssion_start();    include_once("db.class.php");    //测试数据,初始化金额为1000.    // $_ssion['account'] = 1000;    // 获得订单总额    $order_money = $_get['total'];    //获得账户余额    $uid = $_ssion['ui做家教d'];    // var_dump($uid);    $sql = "lect account from tb_ur where id = $uid";    $account = $dao->getone($sql);    if($account>=$order_money){        $order = $_ssion['order'] ;        // 从数据库中减掉库存                foreach($order 2020年国庆节图片as $item){            $kucun = $诗作item['num'];            $id = $item['goods_id'];   蔡上机         $sql = "update tb_goods t number =number-{$kucun} where id ={$id}";            // var_dump($sql);            // die();            $dao->exec($sql);        }                            //减去金额            $account-=$order_money;        $sql = "update tb_ur t account = {$account} where id = $uid";  娃组词有哪些      $dao->exec($sql);        echo "下单成功！账户余额：￥$account";        $_ssion['order'] = '';    }el{        echo "下单失败！订单所需金额:$order_money,账户余额：￥$account,余额不足!!";            }        ?>

业务逻辑

下单之后用户要进行判断库存，和用户金额是否充足。

充足的话进行修改数据库的库存和余额。