3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = empty(1); var_dump($a);
Output for 7.3.13 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(false)

preferences:
138.76 ms | 402 KiB | 139 Q