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 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
104.72 ms | 402 KiB | 121 Q