如何使用PHP進行程式碼重構和重組

function calculateProductPrice($product) {
    // 计算产品价格的复杂逻辑
}

function getDiscountedPrice($product) {
    // 根据产品折扣计算折扣后的价格
}

function displayProductPrice($product) {
    // 显示产品价格
    $price = calculateProductPrice($product);
    $discountedPrice = getDiscountedPrice($product);
    echo "原价：$price，折后价：$discountedPrice";
}

class Product {
    private $name;
    private $price;

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

    public function getName() {
        return $this->name;
    }

    public function getPrice() {
        return $this->price;
    }
}

class Discount {
    private $product;
    private $discountRate;

    public function __construct($product, $discountRate) {
        $this->product = $product;
        $this->discountRate = $discountRate;
    }

    public function getDiscountedPrice() {
        return $this->product->getPrice() * (1 - $this->discountRate);
    }
}

// 优化前
for ($i = 0; $i < count($array); $i++) {
    $item = $array[$i];
    // 处理$item
}

// 优化后
$count = count($array);
for ($i = 0; $i < $count; $i++) {
    $item = $array[$i];
    // 处理$item
}