Generate ordinal, easy way in PHP (see: http://blog.ikraftsoft.com/post/174637756/)

get_ordinal.php

function get_ordinal($num) {
    $temp_num = ($num > 31) ? ($num % 31) + 1 : $num;
    return $num . date('S', mktime(0, 0, 0, $temp_num, 0, 0));
}