PHPでの連想配列のクラス化：型安全性とコード品質の向上

class Product {
    private string $name;
    private float $price;

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

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

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

    public function setName(string $name): void {
        $this->name = $name;
    }

    public function setPrice(float $price): void {
        $this->price = $price;
    }
}

public function setPrice(float $price): void {
    if ($price < 0) {
        throw new InvalidArgumentException("価格は正の数である必要があります。");
    }
    $this->price = $price;
}