Number to ordinal format

ordinal.php

<?php
if (!function_exists('ordinal')) {
    /**
     * Number to ordinal format
     *
     * @param	int $number
     * @return	string
     */
    function ordinal($number)
    {
        $ends = ['st', 'nd', 'rd'];
        $mod  = $number % 100;
        $key  = ($number % 100) - 1;

        if ($mod > 10 && $mod < 14) {
            return $number . 'th';
        }

        return $number . (isset($ends[$key]) ? $ends[$key] : 'th');
    }
}
?>