//提交订单

    function add_order(){

        session_start();

        // var_dump($_SESSION);

        // die();

        // session_destroy();

        // die();

        $ary =$_POST['order'];
$ary= json_decode($ary, true);
// var_dump($data1);

        // die();

        $shop_list = $ary['order'];

        $total_money = $ary['order_money'];

        $obj =UserModel::getInstance();

        //获得user_id

            $user_id = $_SESSION['uid'];

            //获得对应的cart_id

            $sql = "select id from cart where user_id = '$user_id'";

            $cart_id = $obj->getOne($sql);

        // $arr = $_SESSION['gwc'];

        foreach($shop_list as $k=> $shop){

            // var_dump($k);

            // die();

            // 获取对应商品的订单金额

            $xiaoji = $ary[$k];

            // 获取8位随机值作为order_id

    $strs="QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm";

 $random=substr(str_shuffle($strs),mt_rand(0,strlen($strs)-11),8);

            $order_id = strval(time())."$random";

            //插入一条订单

            $sql = "INSERT INTO orders(id,user_id,xiaoji) VALUES ('$order_id', '$user_id',$xiaoji)";

            $obj->exec($sql);

            // die();

            // echo "$sql";

            // die();

            foreach($shop as $sid=> $sku_id){

                // 拼接sku_id

                // $sku_id = "$goods_id"."_"."$color_id"."_"."$size_id";

                $number ="num_$sku_id";

                $price = "price_$sku_id";

                $num = $ary[$number];

                $pay_price = $ary[$price];

                //插入一条sku_orders记录

                $sql = "INSERT INTO orders_sku(sku_id,orders_id,num,pay_price) VALUES ('$sku_id','$order_id',$num,$pay_price)";

                // echo("$sql");

                // die();

                $obj->exec($sql);

                // $sql = "select count(*) from cart_sku";

                // echo("$sql");

                // die();

                // $_SESSION["goods_number"] = $obj->getOne($sql);

                $_SESSION["goods_number"]--;

                $sql = "delete from cart_sku where sku_id = '$sku_id' and cart_id = '$cart_id'";

                // echo("$sql");

                // die();

                $obj->exec($sql);

            }

        }

        echo "OK";

        exit;

        // die();

    }