How to make subdomain work in Codeigniter?

Question

CodeIgniter

There is a main site mysite.ru
It is necessary to make it so that when loading the site m. mysite.ru the
controller mymobilecontroller was executed .

Answer 1

a simple option - a copy of the framework to a subdomain; you can move the system/ folder for all domains\subdomains to a higher level so that it is common, make only application/ different in each folder of the domain\subdomain
difficult option - setting up a subdomain on the server, with the dns script, then .htaccess