PHP function to get ordinal number.Pass it a number and it will return the number suffixed with either of "st" (like 1st), "th" (like 4th), "nd" (like 2nd), "rd" (like 3rd).

ordinal_number.php

<?php
/**
* ordinal_number.php - PHP function to get ordinal number.
* Pass it a number and it will return the number suffixed with either 
* of "st" (like 1st), "th" (like 4th), "nd" (like 2nd), "rd" (like 3rd).
* Copyright (C) 2016 Prabhas Gupte
* 
* This is free script: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* This script is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* 
* You should also see <http://www.gnu.org/licenses/gpl.txt>
*/
function ordinal_number($number) {
	$ends = array('th','st','nd','rd','th','th','th','th','th','th');
	if (($number % 100) >= 11 && ($number % 100) <= 13) {
		$abbreviation = $number. 'th';
	}
	else {
		$abbreviation = $number. $ends[$number % 10];
	}
	
	return $abbreviation;
} // ordinal_number

for($i=0; $i<20; $i++) {
  echo '<br />' . ordinal_number($i);
}// for
?>

$date wan't correct variable. Replaced it by $number in revision 6f595b86af1e45c84ffe64bde29f994cb29e492b