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