关于dsn的有关问题

    function get_remote_dblist($ip, $port, $user, $pwd) {
        $dsn = "mysql://$user:$pwd@$ip:$port";
        $newDB = $this->load->database ( $dsn , TRUE );
return $newDB->version();
}

$dsn = "mysql://{$user}:{$pwd}@{$ip}/?port={$port}";