CLASS_INIT::rand PHP Метод

    private function rand($num_rand = 32)
    {
        $_str_char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        $_str_rnd = "";
        while (strlen($_str_rnd) < $num_rand) {
            $_str_rnd .= substr($_str_char, rand(0, strlen($_str_char)), 1);
        }
        return $_str_rnd;
    }