该代码在本地多站点测试中进行了测试。看起来还可以，但发现了一个小问题：
-运行后，所有草稿/挂起的帖子都会从列表页中消失，但刷新后会再次出现，不知道为什么。。。

虽然我相信这是无害的，但请在运行此之前备份您的数据库

/*
 * Turn off trackback/pingbacks and comments on all existing multisite sites
 *
 * Important: Run Only Once, visit any admin page and delete/disable the hook 
 * 
 */
add_action(\'admin_init\',\'wpse_55209_run_only_once\');
function wpse_55209_run_only_once()
{   
    global $wpdb;
    $blogs = $wpdb->get_results("
        SELECT blog_id
        FROM {$wpdb->blogs}
        WHERE site_id = \'{$wpdb->siteid}\'
        AND spam = \'0\'
        AND deleted = \'0\'
        AND archived = \'0\'
        AND mature = \'0\' 
        AND public = \'1\'
    ");

    foreach ($blogs as $blog) 
    {
        update_blog_option($blog->blog_id, \'default_ping_status\', \'closed\');
        update_blog_option($blog->blog_id, \'default_pingback_flag\', \'closed\');
        update_blog_option($blog->blog_id, \'default_comment_status\', \'closed\');
        switch_to_blog( $blog->blog_id );
        $wpdb->set_blog_id($blog->blog_id);
        $allposts = $wpdb->get_results("SELECT ID FROM $wpdb->posts WHERE post_status != \'inherit\'" );
        foreach( $allposts as $pt )
        {
            $my_post = array();
            $my_post[\'ID\'] = $pt->ID;
            $my_post[\'comment_status\'] = \'closed\';
            $my_post[\'ping_status\'] = \'closed\';
            wp_update_post( $my_post );
        }
    }
}