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3425177325
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. git-svn-id: https://develop.svn.wordpress.org/trunk@34529 602fd350-edb4-49c9-b593-d223f7449a82