3v4l.org

run code in 300+ PHP versions simultaneously
<?php function counter($start, &$stop){ if ($stop > $start){ return; } $start=$start - 1; ++$stop; counter($start, $stop); } $start = 5; $stop = 2; counter($start, $stop);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
274.91 ms | 404 KiB | 373 Q