Respect\Validation\Rules\Cnpj::validate PHP Method

    public function validate($input)
    {
        //Code ported from jsfromhell.com
        $c = preg_replace('/\\D/', '', $input);
        $b = [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2];
        if (mb_strlen($c) != 14) {
            return false;
        }
        for ($i = 0, $n = 0; $i < 12; $n += $c[$i] * $b[++$i]) {
        }
        if ($c[12] != (($n %= 11) < 2 ? 0 : 11 - $n)) {
            return false;
        }
        for ($i = 0, $n = 0; $i <= 12; $n += $c[$i] * $b[$i++]) {
        }
        if ($c[13] != (($n %= 11) < 2 ? 0 : 11 - $n)) {
            return false;
        }
        return true;
    }