Russian (ukrainian) plural form

plural_ru.php

<?php
/**
 * @param int The number of items
 * @param array Three item forms as for 1, 2-4(22,33), 5(66,78) respectively
 */
function plural_form($n, $forms)
{
    $n = abs($n) % 100;
    $n1 = $n % 10;
    if ($n > 10 AND $n < 20) return $forms[2];
    if ($n1 > 1 AND $n1 < 5) return $forms[1];
    if ($n1 == 1) return $forms[0];
    return $forms[2];
}
// Example usage
plural_form(1, array("месяц", "месяца", "месяцев")); // месяц
plural_form(32, array("месяц", "месяца", "месяцев")); // месяца
plural_form(15, array("месяц", "месяца", "месяцев")); // месяцев