Jeśli wszystko, czego chcesz, to drukowanie niestandardowych danych widżetu (bez interfejsu użytkownika), możesz po prostu zadzwonić display_chess_blogger_widget funkcjonować w display_chess_news_admin_page.

Zakładam jednak, że chcesz mieć podobny interfejs użytkownika widżetu, jaki ma pulpit nawigacyjny, ale tylko na tej niestandardowej stronie menu administratora.

Aby to osiągnąć, musisz dołączyć kod z pulpitu nawigacyjnego. Poniżej znajduje się przykładowy kod wtyczki, który dokładnie to robi:

<?php
/*
Plugin Name: Admin Page Custom Dashboard
*/

// Function to create custom admin page
function create_chess_news_admin_page() {
    add_menu_page(
        'Chess News',                       // Page title
        'Chess News',                       // Menu title
        'manage_options',                   // Capability
        'chess_news',                       // Menu slug
        'display_chess_news_admin_page',    // Function to display the page
        'dashicons-media-text',             // Icon URL
        6                                   // Position in menu
    );
}
add_action( 'admin_menu', 'create_chess_news_admin_page' );

// Function to display the custom admin page
function display_chess_news_admin_page() {
    if ( ! current_user_can( 'manage_options' ) ) {
        wp_die( 'You do not have permission to view this page.' );
    }
    ?>
    <div class="content-body">
        <h1>Chess News</h1>
        <p>Welcome to the Chess News admin page.</p>
        <?php
            // Load Dashboard
            display_chess_dashboard_ui(); 
        ?>
    </div><!-- content-body -->
    <?php
}

// This function prints the custom dashboard UI for this admin menu page
function display_chess_dashboard_ui() {
    // Include the admin dashboard code from WP core
    require_once ABSPATH . 'wp-admin/includes/dashboard.php';

    create_chess_blogger_dashboard_widget();
    ?>
    <div class="wrap">
        <div id="dashboard-widgets-wrap">
            <?php
                // Display this custom dashboard just like the main admin dashboard,
                // but with custom Widgets for this custom admin page only
                wp_dashboard();
            ?>
            <div class="clear"></div>
        </div><!-- dashboard-widgets-wrap -->
    </div><!-- wrap -->
    <?php
}

// Function to create custom dashboard widget
function create_chess_blogger_dashboard_widget() {
    // Chess blogger RSS widget
    wp_add_dashboard_widget(
        'chess_blogger_widget',         // Widget slug
        'Chess Blogger',                // Widget title
        'display_chess_blogger_widget'  // Function to display the widget
    );

    // Another sample widget
    wp_add_dashboard_widget(
        'chess_info_widget',            // Widget slug
        'Chess Info',                   // Widget title
        'display_chess_info_widget'     // Function to display the widget
    );
}

// Function to display the custom dashboard widget
function display_chess_blogger_widget() {
    // Get RSS feed
    include_once( ABSPATH . WPINC . '/feed.php' );
    $rss = fetch_feed( ' );

    // Check for errors
    if ( is_wp_error( $rss ) ) {
        echo '<p>An error occurred while retrieving the RSS feed.</p>';
        return;
    }

    // Get the 5 most recent items from the RSS feed
    $maxitems = $rss->get_item_quantity( 5 );
    $rss_items = $rss->get_items( 0, $maxitems );

    echo '<ul>';
    foreach ( $rss_items as $item ) {
        echo '<li><a href="' . $item->get_permalink() . '">' . $item->get_title() . '</a></li>';
    }
    echo '</ul>';
}

function display_chess_info_widget() {
    echo '<p>Here is your chess info.</p>';
}

// These scripts are needed for custom dashboard
function chess_dashboard_scripts() {
    wp_enqueue_script( 'dashboard' );
    wp_admin_css( 'dashboard' );
}
add_action( 'admin_enqueue_scripts', 'chess_dashboard_scripts', 9 );

/* 
 * Note: CODE below this line is only for adding the custom widgets to the dashboard.
 * Uncomment if you need it.
 */
// add_action( 'wp_dashboard_setup', 'create_chess_blogger_dashboard_widget' );