Clears the lastcommentmodified cached value when a comment status is changed.

Closes comments on an old post. Hooked to comments_open and pings_open.

Closes comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.

Adds any comments from the given IDs to the cache that do not already exist in cache.

Updates the comment type for a batch of comments.

Adds meta data field to a comment.

Checks whether a comment passes internal checks to be allowed to add.

Hooks WP’s native database-based comment-flood check.

Removes a comment from the object cache.

Removes metadata matching criteria from a comment.