[wp-trac] [WordPress Trac] #17817: do_action/apply_filters/etc. recursion on same filter kills underlying call

[WordPress Trac]

#17817: do_action/apply_filters/etc. recursion on same filter kills underlying call
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 Reporter:  kernfel                              |       Owner:
     Type:  defect (bug)                         |      Status:  reopened
 Priority:  normal                               |   Milestone:  Future
Component:  Plugins                              |  Release
 Severity:  normal                               |     Version:  2.2
 Keywords:  has-patch needs-testing dev-         |  Resolution:
  feedback has-unit-tests                        |     Focuses:
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Comment (by edward_plainview):

 I've recently encountered this same ... "bug" with my Broadcast plugin
 that hooked into the same save_post hook that another plugin at an earlier
 priority used. Took me hours of debugging to find the problem.

 Long story short: the earlier plugin is called, calls save_post itself,
 broadcast is run as per save_post, and then the hook finishes, without
 calling the "outer" save_post loop.

 This needs to be fixed since I wasn't expecting the hook looping to be
 broken. My patch uses foreach loops, but I see that others have suggested
 foreaches also.

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Ticket URL: <https://core.trac.wordpress.org/ticket/17817#comment:59>
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