Controller_Validator_Basic::rule_false PHP Method

    public function rule_false($a)
    {
        // Changes PHP false to 0
        $a = strtolower($a);
        $vals = array('false', 'f', 0, 'no', 'n');
        if (!in_array($a, $vals)) {
            return $this->fail('Must be false');
        }
    }