How to get a referrer?

Question

PHP

Essence:
You need to get textual information, namely the Vkontakte id and the keyword from the search engine with which he came). Further, this whole thing is written to the database
2 problems:
1) if a person came from a search, then the referrer is not displayed for some reason. It is generally empty
2) if a person came from VKontakte, then the ref is also empty (and if the link to my site is from vk, then vk.com/away.php is written in the ref)
What you need:
1) how to make it so that the ref says yandex.ru/?keyword
2) How to make the ref say vk.com/idXXXXXX (You need to get an ID)

Answer 1

Yandex started hiding 100% of referrers from the search :(
Google enabled HTTPS for 100% of users - referrers now...