[wp-trac] [WordPress Trac] #55257: map_deep() function incompatibility with incomplete objects in PHP 8.0+

[WordPress Trac]

#55257: map_deep() function incompatibility with incomplete objects in PHP 8.0+
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 Reporter:  codex-m                              |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  6.3
Component:  Formatting                           |     Version:  5.9.1
 Severity:  major                                |  Resolution:
 Keywords:  has-patch php8 has-unit-tests 2nd-   |     Focuses:
  opinion                                        |
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Comment (by codex-m):

 Thanks guys for all the inputs. Yes, this can happen when we update
 settings for plugins / themes that are no longer active. A case example is
 when a plugin do mass updating user or post meta to update something in dB
 for maintenance purposes (using core functions).

 And then we have these settings in dB for plugins / themes that no longer
 exist (so their class definition is incomplete). This updating will
 complete with PHP 7.4 and below but now breaks with PHP 8.0+. The updating
 will not be completed.

 Yes, I agree that with PHP 8.0 handling makes this error more visible
 (because of fatal error). I added this ticket because I think it would
 help WordPress become more backward compatible with PHP 8.0. This is just
 a suggestion :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/55257#comment:14>
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