/**
 * Variant of the numeral
 *
 * @param array     word in three variant (1, 2, 5)
 *
 * @return string   string for current numeral
 *
 * @example     variantNumeral(array('materiał', 'materiały', 'materiałów'), 5) => 5 materiałów
**/
function variantNumeral(array $words, $num) {
    $num_m1 = $num % 100;

    if ($num_m1 == 1 && $num < 100) {
        $word = $words[0];
    } else {
        $num_m2 = $num_m1 % 10;

        if (($num_m2 > 1 && $num_m2 < 5) && ($num_m1 < 12 || $num_m1 > 14)) {
            $word = $words[1];
        } else {
            $word = $words[2];
        }
    }

    return $num . ' ' . $word;
}