How to set up site redirects depending on the country?

Question

PHP

How to find out that the user is from Russia and redirect him to another site?

Answer 1

ip-api.com
as an option.
In general, there are many different methods. but the majority is based just on the language of the browser and ip.

Answer 2

Accept-Language for locales
Check IP using any Geo IP API for anything else

Answer 3

Can be checked with nginx geo-ip