对PHP写库存管理系统中的订单管理功能进行代码生成

以下是一个简单的PHP代码生成库存管理系统中的订单管理功能的示例：

<?php

// 创建订单类
class Order {
    private $id;
    private $product;
    private $quantity;
    private $price;

    public function __construct($id, $product, $quantity, $price) {
        $this->id = $id;
        $this->product = $product;
        $this->quantity = $quantity;
        $this->price = $price;
    }

    // 获取订单ID
    public function getId() {
        return $this->id;
    }

    // 获取订单产品
    public function getProduct() {
        return $this->product;
    }

    // 获取订单数量
    public function getQuantity() {
        return $this->quantity;
    }

    // 获取订单价格
    public function getPrice() {
        return $this->price;
    }
}

// 创建订单管理类
class OrderManager {
    private $orders;

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

    // 添加订单
    public function addOrder($order) {
        $this->orders[] = $order;
    }

    // 根据订单ID获取订单
    public function getOrderById($id) {
        foreach ($this->orders as $order) {
            if ($order->getId() == $id) {
                return $order;
            }
        }
        return null;
    }

    // 获取所有订单
    public function getAllOrders() {
        return $this->orders;
    }

    // 删除订单
    public function deleteOrder($id) {
        foreach ($this->orders as $key => $order) {
            if ($order->getId() == $id) {
                unset($this->orders[$key]);
                break;
            }
        }
    }
}

// 示例用法
$orderManager = new OrderManager();

// 添加订单
$order1 = new Order(1, 'Product A', 10, 100);
$orderManager->addOrder($order1);

$order2 = new Order(2, 'Product B', 5, 200);
$orderManager->addOrder($order2);

// 获取订单
$order = $orderManager->getOrderById(1);
if ($order != null) {
    echo "Order ID: " . $order->getId() . "\n";
    echo "Product: " . $order->getProduct() . "\n";
    echo "Quantity: " . $order->getQuantity() . "\n";
    echo "Price: " . $order->getPrice() . "\n";
}

// 获取所有订单
$orders = $orderManager->getAllOrders();
foreach ($orders as $order) {
    echo "Order ID: " . $order->getId() . "\n";
    echo "Product: " . $order->getProduct() . "\n";
    echo "Quantity: " . $order->getQuantity() . "\n";
    echo "Price: " . $order->getPrice() . "\n";
}

// 删除订单
$orderManager->deleteOrder(2);

以上代码示例创建了一个Order类来表示订单，OrderManager类用于管理订单。可以通过addOrder方法添加订单，通过getOrderById方法根据订单ID获取订单，通过getAllOrders方法获取所有订单，通过deleteOrder方法删除订单。

请注意，这只是一个简单的示例，实际的库存管理系统可能需要更多的功能和数据验证。您可以根据实际需求进行修改和扩展。