How to transfer a site to a subdomain while keeping the URL?

Question

Domain name market

Hey!
1) There is a site on Joomla in the .рф domain. There are more than a thousand materials.
2) There is a domain in the .ru zone. A subdomain of the form archive.domen.ru was created for the first site.
3) It is necessary to change the domain of the first site so that when you go from third-party sources using the .рф link, you will be transferred to the material on the new domain.
Those. in order not to lose traffic from the .rf domain
How to do it? Thanks

Answer 1

Options:
1) specify a redirect in the domain settings, this is in the domain control panel
2) leave a single php file with approximately the same content on the .rf domain.
How convenient is method 2? You can define anything you like before redirection: city/country/view cookies - and write it to the database, getting statistics.

Answer 2

Mb redict via PHP? The question is a little unclear.