public function rule_if($a)
    {
        $b = $this->pullRule();
        if (!$this->get($b)) {
            $this->stop();
        }

        return $a;
    }
public function rule_if($a)
    {
        $b = $this->pullRule();
        if (!$this->get($b)) {
            $this->stop();
        }

        return $a;
    }
public function rule_if ( $ a ) { $ b = $ this -> pullRule ( ) ; if ( ! $ this -> get ( $ b ) ) { $ this -> stop ( ) ; } return $ a ; }
Advanced logic.
Advanced logic .