public function addServer($tld, $server)
    {
        $this->server[(string) $tld] = (string)$server;
        return $this;
    }
public function addServer($tld, $server)
    {
        $this->server[(string) $tld] = (string)$server;
        return $this;
    }
public function addServer ( $ tld , $ server ) { $ this -> server [ ( string ) $ tld ] = ( string ) $ server ; return $ this ; }
Can be used to add a server for a given TLD.

@param string $tld
@param string $server

@return Whois
Can be used to add a server for a given TLD .