How to get the previous URI?

Question

PHP

I work with the analysis of user data on the site. You need to find out which link the user was on before he ended up on the real one. It's not difficult to get a link to which one it is now (I use $_SERVER['REQUEST_URI']), but I don't know how to get a preliminary one.

Answer 1

$_SERVER['HTTP_REFERER']

Answer 2

At the time of clicking on the link, a request is made to the server, and its address is the request_uri