February 12, 2011 
Definition:
function wp_count_comments( $post_id = 0 ) {}
Retrieve total comments for blog or single post.
The properties of the returned object contain the ‘moderated’, ‘approved’, and spam comments for either the entire blog or single post. Those properties contain the amount of comments that match the status. The ‘total_comments’ property contains the integer of total comments.
Parameters
- int $post_id: Optional. Post ID.
Return values
returns:stats.
Defined filters
- wp_count_comments
apply_filters('wp_count_comments', array()
Source code
function wp_count_comments( $post_id = 0 ) {
global $wpdb;
$post_id = (int) $post_id;
$stats = apply_filters('wp_count_comments', array(), $post_id);
if ( !empty($stats) )
return $stats;
$count = wp_cache_get("comments-{$post_id}", 'counts');
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A HitchHackers guide through WordPress 
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