add 'rd or 'th or 'st dependent on number [duplicate]

Answer 1

I don't know of any built-ins that do this, but this should work:

function ordinal_suffix($num){
    $num = $num % 100; // protect against large numbers
    if($num < 11 || $num > 13){
         switch($num % 10){
            case 1: return 'st';
            case 2: return 'nd';
            case 3: return 'rd';
        }
    }
    return 'th';
}

(note 11, 12 and 13 are special cases - 11th, 12th, 13th vs 11st...)