This filter is documented in wp-includes/comment.php
_close_comments_for_old_posts
Close comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.
_prime_comment_caches
Adds any comments from the given IDs to the cache that do not already exist in cache.
update_comment_cache
Updates the comment cache of given comments.
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clean_comment_cache
Fires immediately after a comment has been removed from the object cache.
clean_comment_cache
Removes a comment from the object cache.
xmlrpc_pingback_error
Default filter attached to xmlrpc_pingback_error.
pingback_ping_source_uri
Default filter attached to pingback_ping_source_uri to validate the pingback’s Source URI
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weblog_ping
Send a pingback.
trackback
Send a Trackback.
privacy_ping_filter
Check whether blog is public before returning sites.
pingback_useragent
Filters the user agent sent when pinging-back a URL.
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pingback
Pings back the links found in a post.
pre_ping
Fires just before pinging back links found in a post.
generic_ping
Sends pings to all of the ping site services.
