3v4l.org

run code in 500+ PHP versions simultaneously
<?php class A { protected function foo(): void { echo 'Hi there'; } } final class B extends A { public function test(): void { self::foo(); } } (new B())->test();
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Hi there

preferences:
56.78 ms | 840 KiB | 4 Q