wp_update_comment_count( int|null $post_id, bool $do_deferred = false )

Updates the comment count for post(s).


When $do_deferred is false (is by default) and the comments have been set to be deferred, the post_id will be added to a queue, which will be updated at a later date and only updated once per post ID.

If the comments have not be set up to be deferred, then the post will be updated. When $do_deferred is set to true, then all previous deferred post IDs will be updated along with the current $post_id.

See also



(int|null) (Required) Post ID.


(bool) (Optional) Whether to process previously deferred post comment counts.

Default value: false


(bool|void) True on success, false on failure or if post with ID does not exist.


File: wp-includes/comment.php

function wp_update_comment_count($post_id, $do_deferred=false) {
	static $_deferred = array();

	if ( empty( $post_id ) && ! $do_deferred ) {
		return false;

	if ( $do_deferred ) {
		$_deferred = array_unique($_deferred);
		foreach ( $_deferred as $i => $_post_id ) {
			unset( $_deferred[$i] ); /** @todo Move this outside of the foreach and reset $_deferred to an array instead */

	if ( wp_defer_comment_counting() ) {
		$_deferred[] = $post_id;
		return true;
	elseif ( $post_id ) {
		return wp_update_comment_count_now($post_id);



Version Description
WP-2.1.0 Introduced.