ordinal.php

<?php
    function ordinal($number) {
        $default = 'th';
        $suffixes = array('th', 'st', 'nd', 'rd');

        if ( ($number % 100 > 10 && $number % 100 < 14) || ($number % 10 > 3 ) ) {
            $result = sprintf('%d%s', $number, $default);
        }
        else {
            $index = $number % 10;
            $result = sprintf('%d%s', $number, $suffixes[$index]);
        }

        return $result;
    }
?>