php-wakeup-sleep-methods.php

<?php

class Room
{
    private $color = 'white';
    private $size  = 'xl';

    public function setColor(string $color): void
    {
        $this->color = $color;
    }

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

$room = new Room;
$room->setColor('Blue');
$serialized = serialize($room);

$unserialized = unserialize($serialized);
echo $unserialized->getColor(); // Blue
//