MIME::byteswap PHP Method

    protected static function byteswap(&$a, $word)
    {
        /*
         * FIXME: add check for big-endian machines, which do not need
         * swapping
         */
        for ($i = 0; $i < count($a); $i += $word) {
            array_splice($a, $i, $word, array_reverse(array_slice($a, $i, $word)));
        }
    }