3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A {public ?string $r = '';} class B extends A {public ?string $r;} (new B);
Output for 7.4.0 - 7.4.32, 8.0.1 - 8.0.24, 8.1.0 - 8.1.11

preferences:
19.09 ms | 409 KiB | 5 Q