How do I share a PHP variable between multiple pages?

Question

The idea/goal:

I have a username and password inside a text file on my computer. The form on the index page allows the user to sign in with their us

Answer 1

You can start a session and put the form values into the $_SESSION variable, which will be available on all pages.

// On the page where your form is submitted:
session_start();
$_SESSION['name'] = $_POST['name'];

// On the page where the user is redirected:
session_start();
echo $_SESSION['name'];

Note that in reality you would probably want to include some form validation too!