可以通过为什么总是显示这呢？

Notice: Undefined variable: shoesnum in /54/949/KY0Y/index.php on line 4

Notice: Undefined variable: shoesprice in /54/949/KY0Y/index.php on line 4

Notice: Undefined variable: shirtnum in /54/949/KY0Y/index.php on line 8

Notice: Undefined variable: shirtprice in /54/949/KY0Y/index.php on line 8

Notice: Use of undefined constant shirtmoney - assumed 'shirtmoney' in /54/949/KY0Y/index.php on line 10

Notice: Undefined variable: orderMoney in /54/949/KY0Y/index.php on line 13