编写一个包含函数的小型自定义插件，以增强提要的默认查询。

下面的示例通过添加所有自定义帖子类型get_post_types()到默认提要。

// add custom post type to wp post-feed
add_action( \'request\', \'fb_add_to_feed\' );

// add to post-feed
function fb_add_to_feed ( $request ) {

    if ( isset( $request[\'feed\'] ) && ! isset( $request[\'post_type\'] ) ) {
        $request[\'post_type\'] = get_post_types ( $args = array (
            \'public\'          => TRUE,
            \'capability_type\' => \'post\'
        ) );
    }

    return $request;
}

// add custom post type to wp post-feed
add_action( \'request\', \'fb_add_to_feed\' );

// add to feed
function fb_add_to_feed ( $request ) {

    if ( isset( $request[\'feed\'] ) && ! isset( $request[\'post_type\'] ) ) {
        $request[\'post_type\'] = array( 
            \'post\', \'stippet\', \'archive\', \'movies\'
        );
    }

    return $request;
}