MY GOD, IT'S FULL OF array_* calls

gistfile1.php

<?php

return array_combine(array_keys($resp), array_map(function($children, $category_id) {
  return array_filter($children, function($category) use ($category_id) {
    return ($category_id == $category['parent_id'] &&
      strpos($category['name'], 'In Nav') === false);
    });
}, $resp, array_keys($resp)));