function number_to_english_ordinal($num) {
  $last_digit = substr((string)$num, -1);
  switch ($last_digit) {
    case 1:
      $suffix = 'st';
      break;
    case 2:
      $suffix = 'nd';
      break;
    case 3:
      $suffix = 'rd';
      break;
    default:
      $suffix = 'th';
      break;
  }
  
  return $num . $suffix;
}