- $last_user = get_userdata( $last );
- $last_user_name = $last_user ? $last_user->display_name : __('Somebody');
- $message = sprintf( __( 'Warning: %s is currently editing this page' ), esc_html( $last_user_name ) );
- $message = str_replace( "'", "\'", "<div class='error'><p>$message</p></div>" );
- add_action('admin_notices', create_function( '', "echo '$message';" ) );