Online PHP editor | output for LRdao

<?php class Rectangle { public int $area { get => $this->height * $this->width; } public function __construct( public int $height, public int $width, ) {} public function __serialize(): array { $properties = new ReflectionClass($this)->getProperties(); return array_reduce($properties, fn (array $values, ReflectionProperty $property): array => [ ...$values, $property->getName() => $property->getValue($this), ], []); } public function __unserialize(array $values): void { $properties = new ReflectionClass($this)->getProperties(); foreach ($properties as $property) { $value = $values[$property->getName()]; $property->setValue($this, $value); } } } $instance = new Rectangle(4, 5); $serialized = serialize($instance); var_dump($serialized); $unserialized = unserialize($serialized); var_dump($unserialized);