Automatically Log In to WordPress (passing login variables)

hmm stuck after all….

I want to pull the username from the URL using $_GET, but when replacing the string ‘admin’ with the same string ‘admin’ from my $_GET variable, it doesn’t work. Very strange… I know I must be missing something.

function auto_login() {
// this works perfectly
$user_login = ‘admin’;

// this does not work even when setting the same variable via query string ?user=admin
// $user_login = $_GET[‘user’];

//get user’s ID
$user = get_userdatabylogin($user_login);
$user_id = $user->ID;

//login
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’);