原因是get_the_modified_author() 不起作用是因为它依赖于在WordPress循环中使用。wp_get_recent_posts() 不设置全局post对象。下面是一个基于原始代码的完整示例get_the_modified_author() 用一些简单的代码来获取最后一个编辑帖子的人的名字（这基本上是get_the_modified_author() 是否）：

/**
 * Add a widget to the dashboard.
 *
 * This function is hooked into the \'wp_dashboard_setup\' action below.
 */
function example_add_dashboard_widgets() {
    wp_add_dashboard_widget(
        \'example_dashboard_widget\', // Widget slug.
        \'Example Dashboard Widget\', // Title.
        \'example_dashboard_widget_function\' // Display function.
    );  
}
add_action( \'wp_dashboard_setup\', \'example_add_dashboard_widgets\' );

function example_dashboard_widget_function() {
    $items_to_show = 10;
    $counter       = 0;
    $recent_posts  = wp_get_recent_posts( [
        \'post_status\' => \'publish\',
        \'numberposts\' => \'50\', // More than we want, but tries to ensure we have enough items to display.
        \'post_type\'   => \'post\'
    ] );

    echo \'<table>
                    <tr>
                        <th>Post Title</th>
                        <th>Author</th>
                        <th>Moderated by</th>
                    </tr>\';

    foreach ( $recent_posts as $recent ) {
        $post_author  = get_user_by( \'id\', $recent[\'post_author\'] );
        $last_user_id = get_post_meta( $recent[\'ID\'], \'_edit_last\', true );
        $last_user    = get_userdata( $last_user_id );

        // Bail out of the loop if we\'ve shown enough items.
        if ( $counter >= $items_to_show ) {
            break;
        }

        // Skip display of items where the author is the same as the moderator:
        if ( $post_author->display_name === $last_user->display_name ) {
            continue;
        }

        echo \'<tr><td><a href="\' . get_permalink( $recent[\'ID\'] ) . \'" title="Read: \' . 
            esc_attr( $recent[\'post_title\'] ).\'" >\' .   $recent[\'post_title\'].\'</a></td>\';
        echo \'<td>\'. esc_html( $post_author->display_name ) .\'</td>\';

        echo \'<td>\'. esc_html( $last_user->display_name ) .\'</td></tr>\';

        $counter++;
    }
    echo \'</table>\';
}

Edit based on feedback from comment: 此代码跳过以下项目的显示：$post_author->display_name === $last_user->display_name. 但这并不是最有效的代码，因为我们查询的项目比需要的多。之所以这样做，是因为我们将跳过一些项目，并希望（尝试）确保至少有10个项目要显示($items_to_show = 10） 。