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Users: Cache database queries within WP_User_Query class.

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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.

git-svn-id: https://develop.svn.wordpress.org/trunk@55657 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Jonny Harris
2023-04-18 11:48:46 +00:00
parent e5057af16e
commit 19bd759db5
8 changed files with 898 additions and 19 deletions
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10
src/wp-includes/user.php
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@@ -1907,6 +1907,7 @@ function clean_user_cache( $user ) {
}
wp_cache_delete( $user->ID, 'user_meta' );
wp_cache_set_users_last_changed();
/**
* Fires immediately after the given user's cache is cleaned.
@@ -5016,3 +5017,12 @@ function wp_register_persisted_preferences_meta() {
)
);
}
/**
* Sets the last changed time for the 'users' cache group.
*
* @since 6.3.0
*/
function wp_cache_set_users_last_changed() {
wp_cache_set( 'last_changed', microtime(), 'users' );
}