使用PHP開發的商城訂單分割與合併功能實現探討

class Order {
    public $orderNumber;
    public $userId;
    public $orderTime;
    public $items;
    
    // 构造函数
    public function __construct($orderNumber, $userId, $orderTime, $items) {
        $this->orderNumber = $orderNumber;
        $this->userId = $userId;
        $this->orderTime = $orderTime;
        $this->items = $items;
    }
    
    // 获取订单总金额
    public function getTotalAmount() {
        $totalAmount = 0;
        foreach ($this->items as $item) {
            $totalAmount += $item->price;
        }
        return $totalAmount;
    }
}

function splitOrder($order, $splitCount) {
    $items = $order->items;
    $itemCount = count($items);
    
    if ($splitCount <= 1 || $splitCount > $itemCount) {
        return [$order];
    }
    
    $itemsPerOrder = ceil($itemCount / $splitCount);
    $subOrders = [];
    
    for ($i = 0; $i < $splitCount; $i++) {
        $start = $i * $itemsPerOrder;
        $subItems = array_slice($items, $start, $itemsPerOrder);
        
        // 生成子订单
        $subOrder = new Order(
            $order->orderNumber . '_' . ($i + 1),
            $order->userId,
            $order->orderTime,
            $subItems
        );
        
        $subOrders[] = $subOrder;
    }
    
    return $subOrders;
}

function mergeOrders($subOrders) {
    if (count($subOrders) <= 1) {
        return $subOrders;
    }
    
    $mergeOrder = clone $subOrders[0];
    
    for ($i = 1; $i < count($subOrders); $i++) {
        $mergeOrder->items = array_merge($mergeOrder->items, $subOrders[$i]->items);
        $mergeOrder->orderNumber .= '_' . ($i + 1);
    }
    
    return $mergeOrder;
}

// 创建一个主订单
$order = new Order('202101010001', '1001', '2021-01-01', [
    new Item('101', '商品1', 20),
    new Item('102', '商品2', 30),
    new Item('103', '商品3', 40),
    new Item('104', '商品4', 50),
]);

// 拆分订单为3个子订单
$subOrders = splitOrder($order, 3);
foreach ($subOrders as $subOrder) {
    echo '子订单号：' . $subOrder->orderNumber . '，总金额：' . $subOrder->getTotalAmount() . PHP_EOL;
}

// 合并子订单为一个整体订单
$mergeOrder = mergeOrders($subOrders);
echo '整体订单号：' . $mergeOrder->orderNumber . '，总金额：' . $mergeOrder->getTotalAmount();