Online PHP editor | refs for CiQth

<?php interface Foo { public function bar(?string $baz = null); } class Fooo implements Foo { public function bar(string $baz = null) { return $baz; } } class Barz extends Fooo { public function bar(?string $baz = null) { return var_export($baz, true); } } $foo = new Fooo(); $bar = new Barz(); var_dump($foo->bar(), $bar->bar());