您可以使用widget_comments_args 筛选以修改“最近的评论”小部件的默认参数：

function wpse80087_widget_comments_args( $args )
{
    $args = array( \'number\' => 5, \'post_type\' => \'attachment\', \'status\' => \'approve\', \'post_status\' => \'inherit\' );
    return $args;
}
add_filter( \'widget_comments_args\', \'wpse80087_widget_comments_args\', 10, 1 );