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Современный PHP 8 — enum, readonly и атрибуты — Readonly-свойства (PHP 8.1)

Фрагмент из «Современный PHP 8 — enum, readonly и атрибуты»: Readonly-свойства (PHP 8.1).

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PHP main.php 
<?php
declare(strict_types=1);

class Order
{
    public function __construct(
        public readonly string $id,
        public readonly \DateTimeImmutable $createdAt,
        private readonly float $amount,
    ) {}

    public function total(): float
    {
        return $this->amount;
    }
}

$order = new Order('ord-1', new \DateTimeImmutable(), 99.5);
// $order->id = 'x';  // Error: Cannot modify readonly property
<?php
declare(strict_types=1);

class Order
{
    public function __construct(
        public readonly string $id,
        public readonly \DateTimeImmutable $createdAt,
        private readonly float $amount,
    ) {}

    public function total(): float
    {
        return $this->amount;
    }
}

$order = new Order('ord-1', new \DateTimeImmutable(), 99.5);
// $order->id = 'x';  // Error: Cannot modify readonly property