private function handlerAdd($group)
    {
        if (!in_array($group, array_keys($this->handler))) {
            $this->handler[$group] = new SubDirectiveHandler($this->base, $group);
            return true;
        }
        return false;
    }
private function handlerAdd($group)
    {
        if (!in_array($group, array_keys($this->handler))) {
            $this->handler[$group] = new SubDirectiveHandler($this->base, $group);
            return true;
        }
        return false;
    }
private function handlerAdd ( $ group ) { if ( ! in_array ( $ group , array_keys ( $ this -> handler ) ) ) { $ this -> handler [ $ group ] = new SubDirectiveHandler ( $ this -> base , $ group ) ; return true ; } return false ; }
Add sub-directive handler

@param string $group
@return bool
Add sub - directive handler