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<?php $arr = ['x', 'y', 'z']; $mask = 5; $count = count($arr); $mask &= pow(2, $count); $offset = $count - 1; $result = []; foreach ($arr as $k => $v) { var_dump($offset, $k); if ($mask >> ($offset - $k)) { $result[] = $v; } } var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
int(2) int(0) int(2) int(1) int(2) int(2) array(0) { }

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