function my_custom_post_type() {
      $labels = array(
        'name'               => 'Books',
        'singular_name'      => 'Book',
        'menu_name'          => 'Books',
        'name_admin_bar'     => 'Book',
        'add_new'            => 'Add New',
        'add_new_item'       => 'Add New Book',
        'new_item'           => 'New Book',
        'edit_item'          => 'Edit Book',
        'view_item'          => 'View Book',
        'all_items'          => 'All Books',
        'search_items'       => 'Search Books',
        'parent_item_colon'  => 'Parent Books:',
        'not_found'          => 'No books found.',
        'not_found_in_trash' => 'No books found in Trash.'
      );

      $args = array(
        'labels'             => $labels,
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array('slug' => 'book'),
        'capability_type'    => 'post',
        'has_archive'        => true,
        'hierarchical'       => false,
        'menu_position'      => null,
        'supports'           => array('title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments'),
        'register_meta_box_cb' => 'add_books_metaboxes'
      );

      register_post_type('book', $args);
    }
    add_action('init', 'my_custom_post_type');

    function add_books_metaboxes() {
      add_meta_box('wpt_books_author', 'Book Author', 'wpt_books_author', 'book', 'side', 'default');
    }

    function wpt_books_author() {
      global $post;
      $author = get_post_meta($post->ID, 'book_author', true);
      echo '';
    }

    function save_books_meta($post_id, $post) {
      if ($post->post_type == 'book') {
        update_post_meta($post_id, 'book_author', sanitize_text_field($_POST['book_author']));
      }
    }
    add_action('save_post', 'save_books_meta', 1, 2);
    
      

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