3v4l.org

run code in 300+ PHP versions simultaneously
<?php function variations($length, $chars) { $unique_chars = count_chars($chars, 3); if ($length <= 0 || $unique_chars <= 0) return 0; $additional = ($length > 1) ? variations($length - 1, $chars) : 0; return pow($unique_chars, $length) + $additional; } echo variations(10, 26);
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, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
146813779479510

preferences:
218.35 ms | 405 KiB | 325 Q