json字符串转为php数组，使用随机字符串生成订单号（学生笔记）

//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();

    }

json_decode($ary, true);这句是把ajax方式传过来的json串，转为php的数组数组形式，还有一种是转为对象。

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$strs="QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm";
$random=substr(str_shuffle($strs),mt_rand(0,strlen($strs)-11),8);

上面两句是从str字符串（包含大小写和数字）获取一个8位的随机值。

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$order_id = strval(time())."$random";这句是使用时间戳和一个随机值拼接形成订单的id。