array(2) {
  [0]=>
  array(4) {
    ["id"]=>
    int(1)
    ["parent_id"]=>
    int(0)
    ["name"]=>
    string(4) "root"
    ["childs"]=>
    array(2) {
      [0]=>
      array(4) {
        ["id"]=>
        int(3)
        ["parent_id"]=>
        int(1)
        ["name"]=>
        string(15) "child 1 of root"
        ["childs"]=>
        array(0) {
        }
      }
      [1]=>
      array(4) {
        ["id"]=>
        int(4)
        ["parent_id"]=>
        int(1)
        ["name"]=>
        string(15) "child 2 of root"
        ["childs"]=>
        array(1) {
          [0]=>
          array(4) {
            ["id"]=>
            int(6)
            ["parent_id"]=>
            int(4)
            ["name"]=>
            string(23) "child 1 of child 2 root"
            ["childs"]=>
            array(0) {
            }
          }
        }
      }
    }
  }
  [1]=>
  array(4) {
    ["id"]=>
    int(2)
    ["parent_id"]=>
    int(0)
    ["name"]=>
    string(5) "root2"
    ["childs"]=>
    array(1) {
      [0]=>
      array(4) {
        ["id"]=>
        int(5)
        ["parent_id"]=>
        int(2)
        ["name"]=>
        string(16) "child 1 of root2"
        ["childs"]=>
        array(0) {
        }
      }
    }
  }
}