Online PHP editor | output for am7LT

<?php declare(strict_types = 1); class Dvach { protected string $dvachProp1 = 'ru'; public function printAllProtectedProperties (): void { $props = get_object_vars($this); foreach (array_keys($props) as $prop) { echo $this->{$prop} . "\n"; } } } class Sosach extends Dvach { protected string $sosachProp1 = 'so'; } class Harkach extends Sosach { protected string $harkachProp1 = 'hk'; } $o = new Harkach(); $o->printAllProtectedProperties();