Cant set CI_ENVIRONMENT

I prefer setting the  .htaccess generated $_SERVER variable in index.php.

Both, $_SERVER and $_ENV are prefixed with `REDIRECT_`

Code:

<?php // index.php
  define('LOCALHOST', 'localhost'===$_SERVER['SERVER_NAME']);

// DEFAULT TO ONLINE
  $_SERVER['CI_ENVIRONMENT'] = 'production';
  if(LOCALHOST) :
    $_SERVER['CI_ENVIRONMENT'] = 'development';
  endif;