Normalize array Labirint

function normalize($a) {
  $outs = [
    "013" =>  "1",
    "123" =>  "2",
    "13"  =>  "3",
    "012" =>  "4",
    "01"  =>  "5",
    "12"  =>  "6",
    "1"   =>  "7",
    "023" =>  "8",
    "03"  =>  "9",
    "23"  =>  "a",
    "3"   =>  "b",
    "02"  =>  "c",
    "0"   =>  "d",
    "2"   =>  "e"];

  $a = str_split($a);
  $a = array_unique($a);
  sort($a);
  $a = implode($a);
  return $outs[$a];
}

function printResult($arr) {
  if (is_array($arr)) {
    foreach ($arr as $ar) {
      if (is_array($ar)) {
        foreach ($ar as $a) {
          if ($a != "") {
            $a = normalize($a);
            echo " $a";
          }
          else {
            echo "f";
          }
        }
        echo "<br/>";
      }
      else {
        if ($ar != "") {
          $ar = normalize($ar);
          echo " $ar";
        }
        else {
          echo "f";
        }
      }
    }
  }
  else echo $arr;
}