Funzione per l'autologin

autologin.php

 /****************************************** */
        // Funzione per l'autologin
        /****************************************** */

        function autologin($user_name){

            $user = get_user_by('login', $user_name );

                    // Redirect URL //
                    if ( !is_wp_error( $user ) )
                    {
                        wp_clear_auth_cookie();
                        wp_set_current_user ( $user->ID );
                        wp_set_auth_cookie  ( $user->ID );

                        $redirect_to = user_admin_url();
                        wp_safe_redirect( $redirect_to );
                        exit();
                    }
        }