Get last Registered Users ID

function add_userid_inf() {
    if (is_user_logged_in()) {
        global $current_user, $wpdb;        
        $args = array(
            'orderby' => 'registered', // registered date
            'order' => 'DESC', // last registered goes first
            'number' => 1 // limit to the last one, not required
        );
        $users = get_users($args);
        $last_user_registered = $users[0]; // the first user from the list
        $UpdateID = $wpdb->query("UPDATE `user_detail` SET `user_id`= '$last_user_registered->ID' WHERE `email`= '$last_user_registered->user_email'"); //Insert User ID to custom table
    }
}

add_action('user_register', 'add_userid_inf');