Discussion on the implementation of mall order splitting and merging functions developed using PHP

Discussion on the implementation of mall order splitting and merging functions developed using PHP

In implementing the order management function of e-commerce websites, order splitting and merging are common requirements. This article will explore how to use PHP to implement the splitting and merging functions of mall orders.

First, we need to define the structure of the order data. Orders usually contain some basic attributes, such as order number, user ID, order time, etc., and also include a series of product information, such as product ID, product name, product price, etc. Here, we define an order class to represent the order object.

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;
    }
}

The items attribute in the order class is an array, representing the list of items in the order. Each product can be represented by a separate class, including attributes such as product ID, product name, and product price.

Next, we need to implement the splitting and merging functions of orders. The order splitting function can split an order into multiple sub-orders according to user needs, while the order merging function can merge multiple sub-orders into an overall order.

First, we implement the order splitting function. Suppose there is a function splitOrder for splitting orders, inputting a main order object and a quantity to be split, and outputting an array of split sub-orders.

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;
}

In the above code, the splitOrder function will divide the product list into equal parts according to the split quantity and generate corresponding sub-orders. The order number of the sub-order is composed of the main order number plus the serial number, such as "main order number_1", "main order number_2", etc.

Next, we implement the merge function of orders. Suppose there is a function mergeOrders used to merge orders, input a group of sub-order objects, and output the merged overall order object.

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;
}

In the above code, the mergeOrders function will merge the product lists of multiple sub-orders into an overall order, and update the order number to the overall number of the sub-order number.

Finally, we can conduct some tests to verify whether the order splitting and merging functions are normal. The following is a simple sample code:

// 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();

Through the above code, we can see that the order splitting and merging functions have been successfully implemented. For splitting, we split a main order containing 4 items into 3 sub-orders, each sub-order only contains 1 or 2 items; for merging, we merge these 3 sub-orders into An overall order.

Through the above examples, we can see that it is very simple to use PHP to implement the splitting and merging functions of mall orders. Of course, there may be more scenarios and requirements in actual applications. We only need to make appropriate modifications and extensions to the code according to actual needs.

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