php代码逻辑题

**PHP代码逻辑题**

### 题目描述在一个在线商城中，用户可以浏览商品列表、添加商品到购物车、结算订单等功能。我们需要设计一个 PHP代码逻辑来实现这些功能。

#### 需求1. 用户可以浏览商品列表，并且可以按照不同的分类（如价格、品牌等）进行排序。
2. 用户可以将商品添加到购物车中，购物车中存储的商品信息包括商品名称、价格、数量等。
3. 用户可以结算订单，系统需要计算总金额并且生成一个订单号。

####代码逻辑我们使用 PHP 来实现这些功能。首先，我们定义一个 `Goods` 类来代表商品信息：

phpclass Goods {
 public $id;
 public $name;
 public $price;
 public $brand;

 function __construct($id, $name, $price, $brand) {
 $this->id = $id;
 $this->name = $name;
 $this->price = $price;
 $this->brand = $brand;
 }
}

phpclass Cart {
 public $goodsList;

 function __construct() {
 $this->goodsList = array();
 }

 function addGoods($goods) {
 array_push($this->goodsList, $goods);
 }

 function getGoodsList() {
 return $this->goodsList;
 }
}

phpclass Order {
 public $id;
 public $totalPrice;
 public $goodsList;

 function __construct($id, $totalPrice) {
 $this->id = $id;
 $this->totalPrice = $totalPrice;
 $this->goodsList = array();
 }

 function addGoods($goods) {
 array_push($this->goodsList, $goods);
 }
}

phpfunction browseGoodsList($goodsList, $sortType) {
 switch ($sortType) {
 case 'price':
 usort($goodsList, function($a, $b) {
 return $a->price - $b->price;
 });
 break;
 case 'brand':
 usort($goodsList, function($a, $b) {
 return strcmp($a->brand, $b->brand);
 });
 break;
 default:
 // do nothing }

 foreach ($goodsList as $good) {
 echo "ID: {$good->id}, Name: {$good->name}, Price: {$good->price}
";
 }
}

phpfunction addGoodsToCart($cart, $goods) {
 $cart->addGoods($goods);
}

phpfunction settleOrder($order) {
 $totalPrice =0;
 foreach ($order->getGoodsList() as $good) {
 $totalPrice += $good->price * $good->quantity;
 }

 echo "Order ID: {$order->id}, Total Price: {$totalPrice}
";
}

php$goods1 = new Goods(1, 'Apple iPhone',5999.99, 'Apple');
$goods2 = new Goods(2, 'Samsung TV',9999.99, 'Samsung');

$cart = new Cart();
addGoodsToCart($cart, $goods1);
addGoodsToCart($cart, $goods2);

browseGoodsList($cart->getGoodsList(), 'price');

$order = new Order(12345,5999.99 +9999.99);
addGoodsToCart($order, $goods1);
addGoodsToCart($order, $goods2);

settleOrder($order);