TimothyBlynJacobs 72cc029989 Query: Don't attempt caching if running a WP_User_Query before plugins_loaded. ...

In #55594 user meta caching was enabled by default when making a `WP_User_Query`. Previously, this was only enabled if a developer specifically queried for 'all_with_meta' 
fields. User meta caching is implemented using a pluggable function, `cache_users`. If a plugin runs a `WP_User_Query` before pluggable functions have been defined, this 
will now cause a fatal error.

In this commit, a `function_exists` check is introduced to avoid calling `cache_users` if it's not defined. Additionally, a `_doing_it_wrong` notice is issued if the 
`WP_User_Query::query` method is called before the 'plugins_loaded' hook.

Props carazo, subrataemfluence, oakesjosh, spacedmonkey, obenland, SergeyBiryukov, peterwilsoncc.
Fixes #56952.

Built from https://develop.svn.wordpress.org/trunk@54766


git-svn-id: http://core.svn.wordpress.org/trunk@54318 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2022-11-08 17:31:13 +00:00

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