How to attach controller path to internet domain in Yii2 (apache2 setting)?

Question

Apache HTTP Server

A tricky question is the connection between Yii2 and the Apache2 server: an application is written on yii2 that at the address rclick.lvb.sumy.ua/profile/user123 gives everything related to the user user123 , and this is the user's public page, let's say the user has a purchased domain and he wants what would his domain refer to his public page, what would be something like user123.domen.ua really set it up? I so understand if it is real that at the level or apache or htaccess. Any thoughts?