How to check if a php script is being called by another script on the server?

Question

I have a script scripty.php

Sometimes this script gets called through the browser.

Other times it gets called by another script on the server.

How can I (securely) check within scripty.php to see whether or not it is being called by the server?

Answer 1

in the form of an http URL

The $_SERVER["REMOTE_ADDR"] variable that gives you the IP address of the client who made the request should be 127.0.0.1 when the script is called from the server.

Answer 2

you can create a variable before including your script

$by_script = true;
include("new_script.php");

and check it inside

Answer 3

Just a guess: You want to know, if the script its called trough a browser, or from CLI

var_dump(PHP_SAPI);