WordPress at a glance
filter is not described

pings_open filter-hook . WP 2.5.0

Filters whether the current post is open for pings.

Usage

add_filter( 'pings_open', 'filter_function_name_9114', 10, 2 );
function filter_function_name_9114( $open, $post_id ){
	// filter...

	return $open;
}
$open(true/false)
Whether the current post is open for pings.
$post_id(int)
The post ID.

Where the hook is called

pings_open()
wp-includes/comment-template.php 1240
return apply_filters( 'pings_open', $open, $post_id );

Where the hook is used (in WP core)

wp-includes/default-filters.php 244
add_filter( 'pings_open', '_close_comments_for_old_post', 10, 2 );