Comments can be threaded. Now your query can be threaded too! Bonus: it's
not totally insane.
* The new `$hierarchical` parameter for `WP_Comment_Query` accepts three values:
* `false` - Default value, and equivalent to current behavior. No descendants are fetched for matched comments.
* `'flat'` - `WP_Comment_Query` will fetch the descendant tree for each comment matched by the query paramaters, and append them to the flat array of comments returned. Use this when you have a separate routine for constructing the tree - for example, when passing a list of comments to a `Walker` object.
* `'threaded'` - `WP_Comment_Query` will fetch the descendant tree for each comment, and return it in a tree structure located in the `children` property of the `WP_Comment` objects.
* `WP_Comment` now has a few utility methods for fetching the descendant tree (`get_children()`), fetching a single direct descendant comment (`get_child()`), and adding anothing `WP_Comment` object as a direct descendant (`add_child()`). Note that `add_child()` only modifies the comment object - it does not touch the database.
Props boonebgorges, wonderboymusic.
See #8071.
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`WP_Comment_Query` will now report the total number of comments matching the
query params (`comments_found`), as well as the total number of pages required
to display these comments (`max_num_pages`). Because `SQL_CALC_FOUND_ROWS`
queries can introduce a lot of overhead in some cases, we disable the feature
by default. Pass `no_found_rows=false` to `WP_Comment_Query` to enable the
count. (We use the negative parameter name 'no_found_rows' for parity with
`WP_Query`.)
Props wonderboymusic, boonebgorges.
See #8071.
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`WP_Comment_Query` now fetches comments in two stages: (1) a query to get the
IDs of comments matching the query vars, and (2) a query to populate the
objects corresponding to the matched IDs. The two queries are cached
separately, so that sites with persistent object caches will continue to have
complete cache coverage for normal comment queries.
Splitting the query allows our cache strategy to be more modest and precise, as
full comment data is only stored once per comment. It also makes it possible
to introduce logic for paginated threading, which is necessary to address
certain performance problems.
See #8071.
data is only stored once per comment, instead of along with
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The new 'update_comment_meta_cache' parameter, which defaults to `true`, can
be used to disable this behavior.
`update_comment_cache()` has been updated to support an `$update_meta_cache`
parameter, which also updates to true; this matches the pattern we use for
priming post caches.
See #16894.
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* Takes inspiration from `WP_Post` and adds sanity to comment caching.
* Clarifies when the current global value for `$comment` is returned. The current implementation in `get_comment()` introduces side effects and an occasion stale global value for `$comment` when comment caches are cleaned.
* Strongly-types `@param` docs
* This class is marked `final` for now
Props wonderboymusic, nacin.
See #32619.
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Boone Gorges
Drew Jaynes
Scott Taylor