[wp-trac] [WordPress Trac] #43621: Introduce `add_action_once` and `add_filter_once` sugar.

[WordPress Trac]

#43621: Introduce `add_action_once` and `add_filter_once` sugar.
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 Reporter:  soulseekah                           |       Owner:
     Type:  feature request                      |      Status:  new
 Priority:  normal                               |   Milestone:  Awaiting
Component:  Plugins                              |  Review
 Severity:  normal                               |     Version:
 Keywords:  has-patch has-unit-tests dev-        |  Resolution:
  feedback                                       |     Focuses:
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Comment (by soulseekah):

 @vortfu Thanks for looking at this. Indeed, the bug stems from the fact
 that adding a callback with the same name is not possible.
 `_wp_filter_build_unique_id` returns the same ID for it, so
 `_remove_filter_once` is not actually added a second time.

 > could be re-implemented as an anonymous func

 PHP 5.2 does not support anonymous functions, unfortunately. Thus the
 crazy hacking :) (and bugs).

 43621.2.diff contains both the 43621.wp_hook.diff patch and fixes on
 43621.once.diff.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43621#comment:5>
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