February 12, 2011 
Definition:
function wp_update_comment_count($post_id, $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.
Parameters
- int $post_id: Post ID
- bool $do_deferred: Whether to process previously deferred post comment counts
Return values
returns:True on success, false on failure
Source code
function wp_update_comment_count($post_id, $do_deferred=false) {
static $_deferred = array();
if ( $do_deferred ) {
$_deferred = array_unique($_deferred);
foreach ( $_deferred as $i => $_post_id ) {
wp_update_comment_count_now($_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);
}
}
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A HitchHackers guide through WordPress 
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