3v4l.org

run code in 300+ PHP versions simultaneously
<?php function variations($digits, $prefix = '') { $result = []; for ($i = 1; $i <= 3; $i++) { $variation = $prefix . $i; if ($digits > 1) { $result = array_merge($result, variations($digits - 1, $variation)); } else { $result[] = $variation; } } return $result; } print_r(variations(1));
Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Array ( [0] => 1 [1] => 2 [2] => 3 )
preferences:
158.77 ms | 408 KiB | 5 Q