WordPress/wp-includes
spacedmonkey 2a82f1527d Users: Cache database queries within WP_User_Query class.
Cache the results of database queries within `WP_User_Query` class. Only cache queries that are requesting 3 or less fields so that caches are not storing full user objects. Cache results are stored in a new global cache group named `users-queries`. Add a new parameter to `WP_User_Query` called `cache_results` to allow developers to opt out of a receiving cached results. `cache_results` parameter defaults to true. Also add a new helper function called `wp_cache_set_users_last_changed`, similar to `wp_cache_set_posts_last_changed` that incroments last changed value in cache group `users`.  Ensure that `wp_cache_set_users_last_changed` is called whenever user / user meta is modified for proper cache invalidation. 

Props johnjamesjacoby, spacedmonkey, westi, dd32, strategio, srikanthmeenakshi, OllieJones, khoipro, rjasdfiii, flixos90, mukesh27, peterwilsoncc. 
Fixes #40613.
Built from https://develop.svn.wordpress.org/trunk@55657


git-svn-id: http://core.svn.wordpress.org/trunk@55169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-04-18 11:50:27 +00:00
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