wp_insert_post to to_ping – controlling pinging for individual posts

Does anybody know what the ‘to_ping’ parameter is about?

Anyone have any insight on this issue?

Does no one know anything about this?

Is this so obscure that no one knows anything at all…? ??

So this is really really late. But I had the same problem. Ive created a plugin that imports a swedish microblog (www.bloggy.se, like twitter) into your blog. It checks an rss channel and imports all posts into a specific wordpress category. I wanted to ignore the ping (from “Update service”) with these posts. But only these posts.

I looked like a maniac. I havent even been able to find WHERE in the WordPress codes these are sent. Haha.

Anyway. With some luck I find what I think is a solution. By ignoring all the posts from the specific category in the feed. They are not sent by the “Update Service”. I guess the Update Service uses the xml feed when pinging.

To skip the posts I added this (sort of, a bit edited) into my plugin:

function myPlugin_pre_get_posts($wp_query) {
	if ($wp_query->is_feed) {
		$wp_query->query_vars['category__not_in'][] = $category_id_to_skip_in_feed;
	}
}
add_action('pre_get_posts', 'myPlugin_pre_get_posts');