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<?php function permuteUnique($items, $perms = [], &$return = []) { if (empty($items)) { $return[] = $perms; } else { sort($items); $prev = false; for ($i = count($items) - 1; $i >= 0; --$i) { $newitems = $items; $tmp = array_splice($newitems, $i, 1)[0]; if ($tmp != $prev) { $prev = $tmp; $newperms = $perms; array_unshift($newperms, $tmp); permuteUnique($newitems, $newperms, $return); } } return $return; } } $permutations = permuteUnique(["x1", "x2", "x3"]); var_dump($permutations);
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> array(3) { [0]=> string(2) "x1" [1]=> string(2) "x2" [2]=> string(2) "x3" } [1]=> array(3) { [0]=> string(2) "x2" [1]=> string(2) "x1" [2]=> string(2) "x3" } [2]=> array(3) { [0]=> string(2) "x1" [1]=> string(2) "x3" [2]=> string(2) "x2" } [3]=> array(3) { [0]=> string(2) "x3" [1]=> string(2) "x1" [2]=> string(2) "x2" } [4]=> array(3) { [0]=> string(2) "x2" [1]=> string(2) "x3" [2]=> string(2) "x1" } [5]=> array(3) { [0]=> string(2) "x3" [1]=> string(2) "x2" [2]=> string(2) "x1" } }

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