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<?php $payload = ['A', 'B', 'C', 'D']; $total = (1 << count($payload)) - 1; $result = []; for($i = 1; $i <= $total; ++$i){ if(($i & ($i - 1)) == 0) continue; // avoiding single items since you don't wish to have them $curr = []; for($j = 0; $j < count($payload); ++$j){ if(($i & (1 << $j)) > 0){ $curr[] = $payload[ $j ]; } } $result[] = $curr; } usort($result, function($a, $b){ return strcmp( implode("|", $a), implode("|", $b) ); }); print_r($result);
Output for git.master_jit, git.master, rfc.property-hooks
Array ( [0] => Array ( [0] => A [1] => B ) [1] => Array ( [0] => A [1] => B [2] => C ) [2] => Array ( [0] => A [1] => B [2] => C [3] => D ) [3] => Array ( [0] => A [1] => B [2] => D ) [4] => Array ( [0] => A [1] => C ) [5] => Array ( [0] => A [1] => C [2] => D ) [6] => Array ( [0] => A [1] => D ) [7] => Array ( [0] => B [1] => C ) [8] => Array ( [0] => B [1] => C [2] => D ) [9] => Array ( [0] => B [1] => D ) [10] => Array ( [0] => C [1] => D ) )

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