Get an array typed with an specific class on PHP. NameClass[]

typed_array.php

<?php

/**
* Creamos una clase de la cual se crearan los objetos que contendra el array
* El array tendra solo objetos de esta clase. [Product, Product, ...]
*/
readonly class Product
{
    public function __construct(
        private string $name,
        private float $price
    ) {
    }

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

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

/**
* Esta funcion o metodo recibira una array que contendra SOLO objetos de tipo: Product
* [Product, Product, Product, ....] [spread operator to received]
* Esto se llama 'variadic arguments'
*/
function test(Product ...$args)
{
    $total = 0;
    foreach ($args as $product) {
        $total += $product->getPrice() * $product->getQuantity();
    }
    return $total;
}

$product1 = new Product(name: 'product1', price: 10);
$product2 = new Product(name: 'product2', price: 20);
$product3 = new Product(name: 'product3', price: 30);

// Agregando valor por valor
echo test($product1, $product2, $product3); // output: 60

// Agregando un array de objetos [spread operator to send]
echo test(...[$product1, $product2, $product3]); // output: 60