array(2) {
  ["title"]=>
  string(15) "Sort by: Oldest"
  ["key"]=>
  string(11) "post_id ASC"
}

array(2) {
  ["title"]=>
  string(15) "Sort by: Latest"
  ["key"]=>
  string(12) "post_id DESC"
}

array(2) {
  ["title"]=>
  string(18) "Sort by: Title Asc"
  ["key"]=>
  string(14) "post_title ASC"
}

array(2) {
  ["title"]=>
  string(19) "Sort by: Title Desc"
  ["key"]=>
  string(15) "post_title DESC"
}

array(2) {
  ["title"]=>
  string(18) "Sort by: Price Asc"
  ["key"]=>
  string(18) "field_6_NUMBER ASC"
}

array(2) {
  ["title"]=>
  string(19) "Sort by: Price Desc"
  ["key"]=>
  string(19) "field_6_NUMBER DESC"
}