array(1) {
  ["cookie"]=>
  array(1) {
    ["has_js"]=>
    string(1) "1"
  }
}

Default results if you pass no sort-key in:


This is what you get if you pass the default sort-key of WebsiteName in (same as above):


If you pass a different key, TargetMinGrade, it only sorts by that key:


If you pass two keys in, it sorts by the first one first and then the second: