[anthos1984]

Supposed I install CI in site: subdomain.maindomain.com which I have base_url subdomain.maindomain.com
I also rent domain call www.otherdomain.com which is an alias for subdomain.maindomain.com.

When I go to www.otherdomain.com, It will open subdomain.maindomain.com. So how to keep base_url to www.otherdomain.com when
I use that domain for browsing?

I mean to make 2 domains looks as separate domain.

[scalla]

You might have to use cname record to achieve that.

[jreklund]

You need to apply some PHP logic to be able to accept two urls in your base_url config.
https://www.codeigniter.com/user_guide/i...-not-empty

[anthos1984]

Okay, thanks.

So I need to check 'HTTP_HOST' for this detection