Money format, and money amount in words

Money.php

<?php

/**
 * @author Krzysztof Skaradziński <skaradzinski.krzysztof@gmail.com>
 */
class Money
{
    /**
     * @param $value
     *
     * @return mixed
     */
    public function format($value, $divider = 10)
    {
        static $formatter = null;

        if (null === $formatter) {
            $formatter = new \NumberFormatter('pl_PL', \NumberFormatter::CURRENCY);
        }

        $value = $value / $divider;
        $value = round($value, 2);

        return str_replace('zł', '', $formatter->format($value));
    }

    /**
     * @param $value
     *
     * @return string
     */
    public function inWords($value)
    {
        static $formatter = null;

        if (null === $formatter) {
            $formatter = new \NumberFormatter('pl_PL', \NumberFormatter::SPELLOUT);
        }

        $value = str_replace('.', ',', $value);

        if (false === stristr($value, ',')) {
            return sprintf('%s zł', $formatter->format($value));
        }

        list($zl, $gr) = explode(',', $value);
        $gr = str_pad($gr, 2, 0, STR_PAD_RIGHT);

        return sprintf('%s zł, %s gr', $formatter->format($zl), $formatter->format($gr));
    }
}