Array
(
    [0] => diesel
    [1] => herno
)

SLUG dieselbool(false)

SLUG hernoobject(WP_Term)#6564 (11) {
  ["term_id"]=>
  int(2008)
  ["name"]=>
  string(5) "HERNO"
  ["slug"]=>
  string(5) "herno"
  ["term_group"]=>
  int(0)
  ["term_taxonomy_id"]=>
  int(2029)
  ["taxonomy"]=>
  string(13) "product_brand"
  ["description"]=>
  string(0) ""
  ["parent"]=>
  int(0)
  ["count"]=>
  int(82)
  ["filter"]=>
  string(3) "raw"
  ["category_1c_id"]=>
  NULL
}

Array
(
    [0] => diesel
    [1] => HERNO
)

diesel, HERNO