array(3) {
  [1]=>
  array(2) {
    [1]=>
    string(3) "1;4"
    [2]=>
    string(1) "6"
  }
  [2]=>
  array(1) {
    [2]=>
    string(1) "5"
  }
  [3]=>
  array(1) {
    [1]=>
    string(7) "5;1;6;4"
  }
}