How is the publication of the site on landing page generator services implemented?

Question

PHP

Subject.
For example, a user on my domain created a site in the builder and immediately published it after selecting the name/url.
I can not understand the logic of the implementation, on what to implement it.

Answer 1

What is not clear?
All urls start with the same code.
The url makes it clear which landing should be shown.
Well, we show you what you need.