Timothy Jacobs 61f569e81a 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.


git-svn-id: https://develop.svn.wordpress.org/trunk@54766 602fd350-edb4-49c9-b593-d223f7449a82

2022-11-08 17:29:48 +00:00

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