DDD VO basic example

index.php

<?php

// Usage example:
$product1 = new Product("Sample Product", 10.99, "Blue");
$product2 = new Product("Sample Product", 10.99, "Blue");

// Validate product
if ($product1->isValid()) {
    echo "Product is valid.\n";
} else {
    echo "Product is not valid.\n";
}

// Compare products
if ($product1->equals($product2)) {
    echo "Products are equal.\n";
} else {
    echo "Products are not equal.\n";
}

Product.php

<?php

class Product
{
    public function __construct(
        private string $name,
        private float $price,
        private string $color,
    ) {
    }

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

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

    public function getColor(): string
    {
        return $this->color;
    }

    // Validation method
    public function isValid(): bool
    {
        // Basic validation, ensure non-empty name and positive price, weight, and length
        return !empty($this->name) && $this->price > 0;
    }

    // Equality comparison method
    public function equals(Product $otherProduct): bool
    {
        return $this->name === $otherProduct->getName()
            && $this->price === $otherProduct->getPrice()
            && $this->color === $otherProduct->getColor();
    }
}

I leave this gist here just for educational purposes. But this is NOT an Value Object.
The good news is that I can learn:
https://dev.to/ianrodrigues/writing-value-objects-in-php-4acg