How to change the ENVIRONMENT type

When open the index.php file to change the ENVIRONMENT type I have found the following:

PHP Code:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development'); 


In the previous CI version was as the following:

PHP Code:

define('ENVIRONMENT', 'development'); 


And I could change the environment by replace "development" word to ("production" or "testing").

How can I do that in CI 3 ?

For production:

PHP Code:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'production'); 


For testing:

PHP Code:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'testing'); 


For development:

PHP Code:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'development'); 


In the same way.

If I can change it whether

PHP Code:

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'testing');  // testing, production, development 


Or

PHP Code:

define('ENVIRONMENT', 'development');  // testing, production, development 


What is the benefit of the following condition

PHP Code:

isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] 


What is the benefit of the following condition

PHP Code:

isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] 


I think, as a CodeIgniter user you do not have to care about it.

I have found the answer of my question.

http://bldn.se/post/codeigniter-introduc...rverci_env
http://www.patpohler.com/codeigniter-mul...vironments

If you don't use the CI_ENV variable (which I'm guessing you're not), then there's no benefit from it. As I said - you can do it as previously just fine ... whether you remove the condition or not doesn't make a practical difference.

Code:

if(! defined('ENVIRONMENT') )
{
    $domain = strtolower($_SERVER['HTTP_HOST']);
    switch($domain)
    {
        case 'www.yoursite.com' :
            define('ENVIRONMENT', 'production');
        break;
        case 'test.yoursite.com' :
            define('ENVIRONMENT', 'testing');
        break;
        default :
            define('ENVIRONMENT', 'development');
        break;
    }
}

I'm using the above code for my application. Hope it helps