屬性只能接受關聯數組 - PHP OOP

Question

嗨，這是我需要做的：

首先我有一個 class：

class Product
{
    private $name;
    private $price;
    private $sellingByKg;


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

    public function getName()
    {
        return $this->name;
    }
    public function getPrice()
    {
        return $this->price;
    }
    public function getSellingByKg()
    {
        return $this->sellingByKg;
    }

然后我有另一個 class 擴展產品 class：

class MarketStall extends Product
{
    public $products;

    public function __construct(
        $products= [],
        $name = null,
        $price = null,
        $sellingByKg = null
    ) {
        parent::__construct($name, $price, $products);
        $this->products = $products;
    }

我需要做的是屬性產品必須只接受一個關聯數組，其中數組的鍵是產品的名稱，數組的值將是 class 產品的對象。

Answer 1

驗證它是否是一個 assoc 數組。 (PHP8+)

if (array_is_list($products)) {
    throw new Exception("Assoc array expected");
}

Answer 2

我可能會做這樣的事情（未經測試）：

class MarketStall extends Product
{
    public $products;

    public function __construct(
        $products= [],
        $name = null,
        $price = null,
        $sellingByKg = null
    ) {
        parent::__construct($name, $price, $sellingByKg); // You probably meant $sellingByKg here?

        foreach ($products as $key => $product) {
            // If not a Product or the key isn't equal to the product name
            if (!($product instanceof Product::class) || ($key !== $product->getName())) {
                throw new \Exception('Not a valid products array!');
            }
        }

        $this->products = $products;
    }

如果需要，您還可以將該 foreach 循環移動到產品的設置器中。