Online PHP editor | output for RM2Tt

<?php interface Shape { public function getArea(); } class Rectangle implements Shape { private $width; private $height; public function setWidth($width) { $this->width = $width; } public function setHeight($height) { $this->height = $height; } public function getWidth() { return $this->width; } public function getHeight() { return $height->height; } public function getArea() { return $this->height * $this->width; } } class Cube extends Rectangle { public function setWidth($width) { parent::setWidth($width); parent::setHeight($width); } public function setHeight($height) { parent::setWidth($height); parent::setHeight($height); } } function setWidthAndReturnArea(Rectangle $rectangle, $width) { $rectangle->setWidth($width); return $rectangle->getArea(); } $width = 2; $height = 2; $cube = new Cube(); $cube->setWidth($width); $cube->setHeight($height); $area = setWidthAndReturnArea($cube, $width = 4); if ($area == $width * $height) { echo '$cube gedraagt zich als een Rectangle'; } else { echo '$cube gedraagt zich niet als een Rectangle'; }