如何处理记账系统中的账单拆分和合并 - 使用PHP实现账单拆分和合并的方法

<?php
class Bill
{
    private $id;
    private $amount;
    private $categories;

    public function __construct($id, $amount)
    {
        $this->id = $id;
        $this->amount = $amount;
        $this->categories = []; // 初始化为空数组
    }

    public function addCategory($category, $percentage)
    {
        $this->categories[$category] = $percentage;
    }

    public function splitBill()
    {
        $subBills = [];
        foreach ($this->categories as $category => $percentage) {
            $subBillAmount = $this->amount * $percentage / 100;
            $subBills[$category] = new Bill($this->id, $subBillAmount);
        }

        return $subBills;
    }
}

// 示例用法
$originalBill = new Bill(1, 100);
$originalBill->addCategory('餐饮费', 50); // 拆分成50%的餐饮费
$originalBill->addCategory('交通费', 30); // 拆分成30%的交通费
$originalBill->addCategory('住宿费', 20); // 拆分成20%的住宿费

$subBills = $originalBill->splitBill();
print_r($subBills);
?>

<?php
class Bill
{
    private $id;
    private $amount;

    public function __construct($id, $amount)
    {
        $this->id = $id;
        $this->amount = $amount;
    }

    public function mergeBill($bill)
    {
        $this->amount += $bill->amount; // 合并账单金额
    }
}

// 示例用法
$mainBill = new Bill(1, 100);
$subBill1 = new Bill(2, 50);
$subBill2 = new Bill(3, 30);
$subBill3 = new Bill(4, 20);

$mainBill->mergeBill($subBill1);
$mainBill->mergeBill($subBill2);
$mainBill->mergeBill($subBill3);

echo $mainBill->amount;
?>