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Setting up one codeigniter for multiple site:

example root folder: `/home/myweb/public_html/`

to keep it nice and tidy

`/home/myweb/ci` [all codeigniter files]

`/home/myweb/ci/system` [codeigniter system folder & sub-folder]

`/home/myweb/ci/main` [copy of codeigniter /application folder for the main application]

`/home/myweb/ci/other` [another copy of codeigniter /application folder for the other application]

`/home/myweb/public_html/index.php` [for the main application]
```php
$system_path = '../ci/system';
$application_folder = '../ci/main';
```

`/home/myweb/public_html/subdomain/index.php` [for the other application]
```php
$system_path = '../../ci/system';
$application_folder = '../../ci/other';
```