Online PHP editor | output for ct7Ti

<?php class A { protected $var; public function __construct(string $var = '') { $this->var = $var; } public function setVar(string $var) { $this->var = $var; } } class B extends A { public function __construct(A $class) { parent::__construct($class->var); } public function getVar(): string { return $this->var; } } $classA = new A(); $classA->setVar('howdy, partner'); $classB = new B($classA); var_dump($classB->getVar());