3v4l.org

run code in 300+ PHP versions simultaneously
<?php function nek($i) { if ($i <= 1) { echo "1 = "; return 1; } echo "$i * "; return $i * nek($i-1); } echo nek(10);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 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
10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 3628800
preferences:
230.84 ms | 405 KiB | 356 Q