It is necessary that the database displays information about people who visited the landingpage (from which site they came) how is this implemented?

Question

PHP

it is necessary that the database displays information about people who visited the landingpage (from which site they came from) and the data that they will leave if they want, how is this implemented? (framework?)
ps just need to know how it all happens, I will not be coding (for me too early) =B

Answer 1

Here they write that in a nutshell it is impossible to write.
Write - Monitor HTTP Referer header.

Answer 2

already carried out several similar projects. In 2 words, the principle, of course, cannot be described. We can sell an already configured solution