function number_to_english_ordinal($num) {
  $suffix = array('1'=>'st','2'=>'nd','3'=>'rd');
  $worknum = $num>100 ? substr($num,-2) : $num;
  if (in_array($worknum,array('11','12','13'))) return $num.'th';
  $last_digit = substr((string)$worknum, -1);
  return $num . (isset($suffix[$last_digit])?$suffix[$last_digit]:'th');
}