3v4l.org

run code in 500+ PHP versions simultaneously
<?php $sum = fn($a, $sum) => empty($a) ? 0 : array_pop($a) + $sum($a, $sum); print $sum([1,2,3], $sum); ?>
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
6
preferences:
68.58 ms | 864 KiB | 4 Q