Pass variables between two PHP pages without using a form or the URL of page

Question

I want to pass a couple of variables from one PHP page to another. I am not using a form. The variables are some messages that the target page will display if something goes

Answer 1

Use Sessions.

Page1:

session_start();
$_SESSION['message'] = "Some message"

Page2:

session_start();
var_dump($_SESSION['message']);