[wp-trac] [WordPress Trac] #58458: Move the load of `array_keys` to a different level in the `WP_Hook` class

[WordPress Trac]

#58458: Move the load of `array_keys` to a different level in the `WP_Hook` class
-------------------------+-----------------------------
 Reporter:  bor0         |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:  trunk
 Severity:  normal       |   Keywords:  has-patch
  Focuses:  performance  |
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 Since `apply_filters` is one of the most commonly called functions, it
 makes sense to not call `array_keys` every time there, rather, pre-compute
 it and use it only when needed.

 With this patch, we reduce the number of calls by at least 500 (on a basic
 WP installation) but may scale up depending on plugins, etc. Thereby,
 improving the performance, if only slightly.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58458>
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