How to restrict access to data given in JSON through PHP?

Question

PHP

I have data in JSON form at a certain address, on the project.
Tell me how you can limit the output, according to the source of their appeal. Those. now anyone accessing a certain URL (knowing it) can see this data.
How to make a filter by IP or domain from which the request comes?

Answer 1

php.net/manual/en/features.http-auth.php

Answer 2

As an option - use the additional parameter $_GET / $_POST, or http header.