Online PHP editor | output for E27tX

<?php abstract class Base { protected $foo = null; final public function __construct(Granny $init = null) { return $this->init($init); } abstract protected function init(Granny $dependency = null); } class Granny { protected $name = null; protected $age = null; public function __construct(array $vals = null) { foreach($vals as $name => $val) { $name = 'set'.ucfirst($name); if (method_exists($this, $name)) { $this->{$name}($val); } } return $this; } //basic gettter && setters public function getAge() { return $this->age; } public function setAge($age = null) { $this->age = $age === null ? null : (int) $age; return $this; } } class Dad extends Granny { //Dad's secret private $likesMom = null; public function getLikesMom() { return $this->likesMom; } public setLikesMom($bool = null) { $this->likesMom = $bool === null ? null : !!$bool; return $this; } } class Ball extends Base { protected function init(Dad $dependency = null) { $this->foo = $dependency; return $this; } } var_dump(new Ball());