代码：无法使用提供的设置连接到数据库服务器

我使用codeigniter作为cms框架，如果数据库主机名是localhost，它工作正常。

I use codeigniter as cms framework, if database hostname is localhost, it works correctly.

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'root';
$db['default']['password'] = 'test';
$db['default']['database'] = 'jinma';
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;

使用上述配置可以正常工作，但如果主机名更改为：

Using above configuration works correctly, but if hostname is changed to:

$db['default']['hostname'] = '192.168.1.222';

发生数据库错误：

Unable to connect to your database server using the provided settings.
Filename: third_party/fuel/Loader.php
Line Number: 134

和我可以ssh 192.168.1.222，
同时在192.168.1.222，当hostname是localhost也是确定。

and i can ssh 192.168.1.222, Meanwhile in 192.168.1.222, it's also ok when hostname is localhost.

我在google搜索并得到一个解决方案add：

I searched in google and got a solution to add:

$db['default']['port'] = '3306';

但不适用于我，任何想法？

but it doesn't work for me, any idea?

谢谢，这是我的第一个问题，对不起是愚蠢的。

Thank you, this is my first question, sorry to be stupid.