Controller_Validator_Basic::rule_decimal_places PHP Method

    public function rule_decimal_places($a)
    {
        $places = $this->pullRule();
        $pattern = sprintf('/^[0-9]+\\.[0-9]{%s}$/', $places);
        if (!preg_match($pattern, $a)) {
            return $this->fail('Must have {{arg1}} decimal places', $places);
        }
    }