Ticket #35060: 35060.2.diff

src/wp-includes/comment.php

@@ -2055 +2055 @@
                 return false;
 
         $old = (int) $post->comment_count;
-        $new = (int) $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id) );
+
+        /**
+        * Filters a post's comment count before it is updated in the database.
+        *
+        * @since 4.5.0
+        *
+        * @param null $new     The new comment count.
+        * @param int  $old     The old comment count.
+        * @param int  $post_id Post ID.
+        */
+        $new = apply_filters( 'wp_update_comment_count_new', null, $old, $post_id );
+
+        if ( ( $new !== null ) && is_numeric( $new ) && ( 0 <= $new ) ) {
+                $new = (int) $new;
+        }
+        else {
+                $new = (int) $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id) );
+        }
+
         $wpdb->update( $wpdb->posts, array('comment_count' => $new), array('ID' => $post_id) );
 
         clean_post_cache( $post );