3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo nek(6); function nek($i) { if ($i <= 1) { return 1; } return $i * nek($i-1); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
720