// Function to get the current page title
function get_current_page_title() {
    return get_the_title();
  //also if you want id then replace title with id
}

// Register the shortcode
function register_page_title_shortcode() {
    add_shortcode('page-title', 'get_current_page_title');
}
add_action('init', 'register_page_title_shortcode');


//to get the visitor visiting page id:
    $page_id = get_current_page_id();