The 'last_changed' incrementor is used to invalidate the `get_terms()` query
cache. Since `get_terms()` queries may reference 'meta_query', changing term
metadata could change the results of the queries. So we invalidate the cache
on add, delete, and update.
See #10142.
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Adds a new table to the database schema (`wp_termmeta`), and a set of
`*_term_meta()` API functions. `get_terms()` and `wp_get_object_terms()`
now also support 'meta_query' parameters, with syntax identical to other
uses of `WP_Meta_Query`.
When fetching terms via `get_terms()` or `wp_get_object_terms()`, metadata for
matched terms is preloaded into the cache by default. Disable this behavior
by setting the new `$update_term_meta_cache` paramater to `false`.
To maximize performance, within `WP_Query` loops, the termmeta cache is *not*
primed by default. Instead, we use a lazy-loading technique: metadata for all
terms belonging to posts in the loop is loaded into the cache the first time
that `get_term_meta()` is called within the loop.
Props boonebgorges, sirzooro.
See #10142.
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If your plugin or site does rely on this behaviour, the arguments that are passed to `register_taxonomy()` should be altered so that `show_ui` is `true`, and arguments such as `show_in_menu` and `show_in_nav_menus` are false.
Fixes#33938
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[13216] introduced the 'public' argument for `register_taxonomy()`. This param
was used to set defaults for 'show_ui' and a number of other params, but it
never did anything itself.
With this changeset, taxonomies registered with `public=false` will no longer
be queryable on the front end, ie via taxonomy archive queries.
Props wpsmith, ocean90, nacin, ericlewis, boonebgorges.
Fixes#21949.
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[29128] introduced updated documentation for the `'orderby'` parameter of
`get_terms()`. The new documentation mistakenly said that 'term_id' was a valid
orderby value. The current changeset makes that fantasy...A REALITY.
Props ixkaito.
Fixes#33726.
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