add_action( \'add_meta_boxes\', \'attached_images_meta\' );

function attached_images_meta() {
    $screens = array( \'post\', \'page\' ); //add more in here as you see fit
    foreach ($screens as $screen) {
        add_meta_box(
            \'attached_images_meta_box\', //this is the id of the box
            \'Attached Images\', //this is the title
            \'attached_images_meta_box\', //the callback
            $screen, //the post type
            \'side\' //the placement
        );
    }
}
function attached_images_meta_box($post){
    $args = array(\'post_type\'=>\'attachment\',\'post_parent\'=>$post->ID);
    $count = count(get_children($args));
    echo \'<a href="#" class="button insert-media add_media" data-editor="content">\'.$count.\' Images</a>\';
}

以上内容将链接到媒体上载程序。我添加了链接，因为你发布的屏幕截图看起来像一个链接。请随意删除链接，如下所示：

echo $count.\' Images\';

只要在你的函数中弹出这个。php、自定义插件等。