父子数组结构

Question

I have right following code for to set Parent-Child Array Structure like..

$refs = array();
$list = array();

            while($QryRow_Category_sub = mysqli_fetch_assoc($QryResult_Category)) 
            {
                $thisref = &$refs[$QryRow_Category_sub['id']];

                $thisref['parent_id'] = $QryRow_Category_sub['parent_id'];
                $thisref['name'] = $QryRow_Category_sub['name'];

                if ($QryRow_Category_sub['parent_id'] == 0) {
                //echo &$thisref;
                    $list[$QryRow_Category_sub['id']] = &$thisref;
                } else {
                    $refs[$QryRow_Category_sub['parent_id']]['children'][$QryRow_Category_sub['id']] = &$thisref;
                }
            }

And this is my Output

   Television Cat - 1
      Television Cat - 1 Sub Cat - 1
      Television Cat - 1 Sub Cat - 2
   Television Cat - 2
      Television Cat - 2 Sub Cat - 1
   Television Cat - 3
      Television Cat - 3 Sub Cat - 1
   Television Cat - 4
      Television Cat - 4 Sub Cat - 1

   Television Cat - 1 Sub Cat - 1
   Television Cat - 1 Sub Cat - 2
   Television Cat - 2 Sub Cat - 1
   Television Cat - 3 Sub Cat - 1
   Television Cat - 4 Sub Cat - 1

This my code and i got the result good, but i have one problem with this. But i want to remove the following code from the output

Television Cat - 1 Sub Cat - 1
   Television Cat - 1 Sub Cat - 2
   Television Cat - 2 Sub Cat - 1
   Television Cat - 3 Sub Cat - 1
   Television Cat - 4 Sub Cat - 1

This is the duplicate entry of sub-category.

Please give a solution. Thank You.