Online PHP editor | output for qse0Z

<?php class TestParent { public function __construct(?string $test = null) { echo 'test'; } } class TestChild extends TestParent { public function __construct() { parent::__construct(); } } new TestChild(); <?php class TestParent { public function __construct(?string $test = null) { echo 'test'; } } class TestChild extends TestParent { public function __construct($foo = 'bar') { parent::__construct(); } } new TestChild();