Comments (pings) (category)

comment_form_default_fields

Allows you to modify, add, or remove comment form fields such as name, email, and website.

comment_post

Fires immediately after a comment is added to the database. The event passes the comment ID, status, and data.

comments_popup_link_attributes

Filters the attributes of the link output by comments_popup_link().

edit_comment

Fires immediately after a comment has been updated in the database.

get_comment_author_link

Allows you to change the link to the commenter's website returned by get_comment_author_link().

preprocess_comment

Filters comment data before it is sanitized and added to the database. The filter fires at the very beginning of wp_new_comment(), which adds a new comment.

respond_link

Filters the response URL (the link to the comments) when a post has no comments. Clicking the link takes the user to the comment form (the link contains an anchor).

wp_count_comments

Allows you to change the comment count for a specified post or for the site as a whole.