3v4l.org

run code in 500+ PHP versions simultaneously
<?php json_encode([NAN]);
Output for 8.2.31 - 8.2.33, 8.3.0 - 8.3.33, 8.4.1 - 8.4.25, 8.5.0 - 8.5.10
preferences:
46.7 ms | 781 KiB | 4 Q