public function deliveringEnclosure(string $url, int $length, string $type): self
    {
        $this->enclosures[] = [
                'url'    => $url,
                'length' => $length,
                'type'   => $type
        ];
        return $this;
    }
public function deliveringEnclosure(string $url, int $length, string $type): self
    {
        $this->enclosures[] = [
                'url'    => $url,
                'length' => $length,
                'type'   => $type
        ];
        return $this;
    }
public function deliveringEnclosure ( string $ url , int $ length , string $ type ) : self { $ this -> enclosures [ ] = [ 'url' => $ url , 'length' => $ length , 'type' => $ type ] ; return $ this ; }
add an enclosure to the item

@param   string  $url     location of enclosure
@param   int     $length  length of enclosure in bytes
@param   string  $type    MIME type of enclosure
@return  \stubbles\xml\rss\RssFeedItem
add an enclosure to the item