How to display only parents of resources through pdoTools and is it possible?

Question

PHP

So I came up with a list like:

1. pillows
   
2. sofas
   
3. pillows
   
4. pillows
   

And I want it like this:

1. pillows
   
2. sofas
   

Maybe someone has already experienced this?
________________________
In the resource, the values ​​are always different, something like this &resources=`` - this snippet displays the resources I need, as an option I can write another one, but maybe you can just exclude duplicate categories in pdoT or only display their categories?

Answer 1

I had to write a snippet, maybe someone needs it:

<?php
//
if(!empty($resources)){
  $resources = explode(",",$resources);
  $arr = [];
  foreach($resources as $id){
    $parentIds = $modx->getParentIds($id, 10, array('context' => 'web'));
    $arr[] = $parentIds[0];
  }
  $arr = array_unique($arr);
  $arr = implode(",",$arr);
  return $arr;
}