3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface FooInterface { public function dump(self $baz); } class Foo implements FooInterface { public function dump(self $baz) { var_dump($baz); } } class Bar extends Foo { public function dump(Foo $baz) { parent::dump($baz); }}

preferences:
31.85 ms | 402 KiB | 5 Q