Configuring Multi-Language Support

I want to build multi-language site.

My config/config.php file has:
$config['language'] = 'turkish';
setting.

My config/autoload.php file has:
$autoload['helper'] = array('url','form','cookie','security','language');
and
$autoload['language'] = array('turkish','english');

Now; what my i do for language switch base on user language selection? What is the best method?

Hi

Please read this article may be helpful.
http://www.codexworld.com/multi-language...deigniter/

Thank you. Bu i read this document before and i know this technique. Bu there isn't any information about autoload feature of config file

I'm a person from Turkiye. I don't know English very well and i can't write what i want to say sometimes (as now happenes   ).

If i write something by mistake; please don't distress it and try to understand what i want to write.