Simple function for turning a number into an ordinal string.

number-to-ordinal.php

<?php

/**
 * Simple function for turning a number into an ordinal string.
 * source: https://catswhocode.com/php-sanitize-input/
 */
function ordinal($cdnl){ 
    $test_c = abs($cdnl) % 10; 
    $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th' 
            : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) 
            ? 'th' : 'st' : 'nd' : 'rd' : 'th')); 
    return $cdnl.$ext; 
}  

for($i=1;$i<100;$i++){ 
    echo ordinal($i).'<br>'; 
}