array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    string(1) "a"
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    array(0) {
    }
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    NULL
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    int(1)
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(0) {
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    string(1) "a"
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    array(0) {
    }
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    NULL
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(1) {
    [0]=>
    int(1)
  }
}
array(2) {
  [0]=>
  string(0) ""
  [1]=>
  array(0) {
  }
}