Automatic login

I was looking for a way to login automatically and found this piece of code that I adjusted to suit my needs.

I wanted to be able to login as admin via an URL (mostly to be able to easily run upgrades of all my sites). But the code I found would login every visitor as admin – NOT what I was looking for… So I changed it slightly to be more secure:

Insert the following to your functions.php

function auto_login() {
    if (!is_user_logged_in()) {
        $user_login = $_GET['YOUR-OWN-SECRET-KEY'];
        $user = get_userdatabylogin($user_login);
        $user_id = $user->ID;
        wp_set_current_user($user_id, $user_login);
        wp_set_auth_cookie($user_id);
        do_action('wp_login', $user_login);
    }
}
add_action('init', 'auto_login');

Change YOUR-OWN-SECRET-KEY to something that’s not easy to find out, any password creator would help you with this.

Then just make a list of URLs to suit your needs. To go to WP-admin upgrade page, URL looks like:
http://www.domain.com/wp-admin/update-core.php?YOUR-OWN-SECRET-KEY=admin
That is if your admin account login is ‘admin’ (I suggest you change this due to security!)

Now I need to find out how to actually start the upgrade via an URL – but maybe someone else knows how to make that happen…?

Tried adding action=do-core-upgrade, but failed…