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@ 2014-06-09T13:58:06Z

<?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(5, 26);

Output
Performance
VLD
References
Branches

pow: documentation ( source)
count_chars: documentation ( source)

preferences:dark modelive preview

35.86 ms | 402 KiB | 5 Q