How to use $_GET?

Question

I have the following login script, where i do use sessions.

Answer 1

$_GET variables are those passed via the URL, i.e. index.php?foo=bar&baz=qux (foo equals bar, baz equals qux).

These variables are not stored on the server as a part of the session, but rather only exist with that request. If you want to store information on the server as a part of the session, you should use $_SESSION instead, which will exist within the current session, regardless of the request.

Answer 2

The $_GET superglobal is defined as part of the URL string:

http://example.org/index.php?foo=bar&baz=1

In index.php:

echo $_GET['foo']; // bar
echo $_GET['baz']; // 1

So $_GET is not stored on the server, but is passed with each HTTP request, as is $_POST, but that is passed in the HTTP headers rather than simply appened to the end of the URL.