How are links like “username.site.com/” generated?

Question

PHP

Good evening ! How are links like username.site.com generated ?
For example on blogspot'e sab-ras.blogspot.ru

Answer 1

@Bowen what does the engine have to do with it? The author is probably interested in how it happens inside the engine.
In general, he probably wanted to google something like https://www.google.com/search?q=php+create+subdomain or https://www.google.com/search?q=php+create+subdoma. .. but accidentally asked a question on a toaster.

Answer 2

A record of the form
* IN CNAME domain.com is created in DNS.
(all subdomains = alias to the main one).
In the site code, the domain is used as a variable, with which they go to the database and show the desired "site". How exactly the variable is used there - everything is already in your hands)

Answer 3

What's with the subdomains. This is configured by routing.
I think a person is interested in how it is on sites when you register.
Then when you enter your personal account you get: subotinn.example.com

Answer 4

Called subdomains

Поддомен — домен, являющийся частью домена более высокого уровня. Единственные домены, не являющиеся также поддоменами — корневые ...