Display numbers with ordinal suffix, or optionally only the suffix.

ordinal.php

/**
 * Display numbers with ordinal suffix, or optionally only the suffix (helpful
 * for handling superscripts, etc).
 * 
 * Based on http://stackoverflow.com/a/3110033/1786459
 * 
 * @param  Integer  $number
 * @param  Boolean  $suffix_only
 * @return String
 */
function ordinal($number, $suffix_only = false) {
    $ends = ['th','st','nd','rd','th','th','th','th','th','th'];
    $ordinal = '';

    if ((($number % 100) >= 11) && (($number%100) <= 13)) {
        $ordinal = 'th';
    } else {
        $ordinal = $ends[$number % 10];
    }

    if (!$suffix_only) {
        $ordinal = $number . $ordinal;
    }

    return $ordinal;
}