3v4l.org

run code in 300+ PHP versions simultaneously
<?php abstract class Base { protected function doit() { throw new \RuntimeException('Not implemented'); } } class Closed extends Base { protected function doit() { echo 'done!'; } } class Opener extends Base { public function execute(Closed $closed) { $closed->doit(); } } $closed = new Closed(); $opener = new Opener(); $opener->execute($closed);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.22, 7.4.0 - 7.4.10, 8.0.0alpha1 - beta3
done!