How to implement tracking of the source of the transition, which is the redirect?

Question

PHP

I made a redirect at the domain registrar level for all subdomains of the site to the main page of another site. Those. http://*.site.ru leads to site.net
The final task is to put the site in GET on site.net using PHP. Those. I want to get the following result: http://*.site.ru -> site.net?uri=*.site.ru
HTTP_REFERER unfortunately does not accept such a redirect as a referral source. The question is what to do in my case? Are there alternative PHP tools that can detect such a moment? Or maybe you can use htaccess?
Thank you!

Answer 1

The name registrar does not deal with redirects. The registrar can register aliases in the DNS so that all subdomains point to a single IP address.
If a redirect is made, then some web server does it. So it needs to be configured so that it adds a parameter to the address bar.

Answer 2

By means of PHP - there is no reliable method. Use htaccess.
You can still redirect using JS, but this will increase the latency of opening the page.