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run code in 200+ php & hhvm versions
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<?php function powerSet($in,$minLength = 1) { $count = count($in); $members = pow(2,$count); $return = array(); for ($i = 0; $i < $members; $i++) { $b = sprintf("%0".$count."b",$i); $out = array(); for ($j = 0; $j < $count; $j++) { if ($b{$j} == '1') $out[] = $in[$j]; } if (count($out) >= $minLength) { $return[] = $out; } } return $return; } $x = powerSet(array(1,2)); foreach($x as $r) { echo implode($r, ' ') . "\n"; }
Output for 4.3.0 - 7.2.0
2 1 1 2