一个更复杂的 PHP 代码示例，我将展示一个购物车系统的基本实现，它包括商品类、购物车类和一些基本的操作方法。

name = $name;
    $this->price = $price;
  }

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

  public function getPrice() {
    ret服务器托管网urn $this->price;
  }
}

// 定义购物车类
class ShoppingCart {
  private $products;

  public function __construct() {
    $this->products = [];
  }

  public function addProduct(Product $product) {
    $this->products[] = $product;
  }

  public function removeProduct($productName) {
    foreach ($this->products as $key => $product) {
      if ($product->getName() === $productName) {
        unset($this->products[$key]);
        break;
      }
    }
  }

  public function getTotalPrice() {
    $totalPrice = 0;
    foreach ($this->products as $product) {
      $totalPrice += $product->getPrice();
    }
    return $totalPrice;
  }

  public function checkout() {
    $totalPrice = $this->getTotalPrice();
    $formattedPrice = number_format($totalPrice, 2);
    echo "总价: $" . $formattedPrice . "
";
    // 其他结账逻辑......
  }
}

// 创建一些商品实例
$product1 = new Product("手机", 999.99);
$product2 = new Product("笔记本电脑", 1599.99);
$product3 = new Product("耳机", 89.99);

// 创建购物车实例
$cart = new ShoppingCart();

// 添加商品到购物车
$cart->addProduct($product1);
$cart->addProduct($product2);
$cart->addProduct($product3);

// 移除商品
$cart->removeProduct("手机");

// 结账
$cart->checkout();

?>