3v4l.org

run code in 300+ PHP versions simultaneously
<?php if ('null') echo 'Passes!'; else echo 'Fails :(';
Output for 8.1.32, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Passes!
preferences:
48.76 ms | 406 KiB | 5 Q