Question: What is equalient of $\_SERVER in codeigniter ?

Answer: 
```
$this->input->server()

```

For more information, please refer to the User Guide : [Input](http://codeigniter.com/user_guide/libraries/input.html)
I think you can use $\_SERVER like they did about the "Automatic configbase url" in the "official" CodeIgniter wiki (http://codeigniter.com/wiki/Automatic\_configbase\_url/)