[wp-trac] [WordPress Trac] #47884: Unable to remove "counts" from non persistent cache groups

[WordPress Trac]

#47884: Unable to remove "counts" from non persistent cache groups
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 Reporter:  Maciej Laskowski  |       Owner:  (none)
     Type:  defect (bug)      |      Status:  assigned
 Priority:  normal            |   Milestone:  Awaiting Review
Component:  Cache API         |     Version:  2.6
 Severity:  normal            |  Resolution:
 Keywords:  close             |     Focuses:  performance
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Comment (by boonebgorges):

 > Do you have any opinion on the side note about missing function_exists
 check for wp_cache_add_non_persistent_groups?

 Looking at the `function_exists()` call in [7986], I'm guessing the
 thought was: Any drop-ins existing before [7986] would not have the two
 new functions, but any new drop-ins created afterward presumably would,
 because they'd be created from the up-to-date cache.php. Based on this
 assumption, the single `function_exists()` check is enough, since the
 functions were introduced at the same time. The only way to trigger a
 fatal here would be through an incorrectly built drop-in, and if it hasn't
 cropped up in the past 11 years, I'd say it's not worth guarding against
 now.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47884#comment:6>
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