Online PHP editor | refs for MrS0H

<?php function combs($letters) { $result = array(); //array_fill(0, count($letters)+1, array()); var_dump($result); $lettersCount = count($letters); for ($i = 0; $i < $lettersCount; ++$i) { for ($j = $lettersCount - $i; $j > 0; --$j) { $result[$j][] = implode(', ', array_slice($letters, $i, $j)); } } array_shift($result); return $result; } $arr = array('a', 'b', 'c', 'd', 'e', 'f'); print_r(combs($arr));