3v4l.org

run code in 300+ PHP versions simultaneously
<?php function variations($digits, $prefix = '') { for ($i = 1; $i <= 3; $i++) { $variation = $prefix . $i; if ($digits > 1) { variations($digits - 1, $variation); } else { echo $variation . PHP_EOL; } } } variations(1);
Output for 5.6.38, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
1 2 3
preferences:
92.35 ms | 407 KiB | 5 Q