public function url($url = null)
    {
        if ($url === null) {
            return $this->_url;
        }
        $this->_url = $url;

        return $this;
    }
public function url($url = null)
    {
        if ($url === null) {
            return $this->_url;
        }
        $this->_url = $url;

        return $this;
    }
public function url ( $ url = null ) { if ( $ url === null ) { return $ this -> _url ; } $ this -> _url = $ url ; return $ this ; }
Get or set the url.

@param null|array $url
@return MenuItem|array
Get or set the url .