[wp-trac] [WordPress Trac] #53299: [PHP 8.1] Update `is_serialized` function to accept Enums

[WordPress Trac]

#53299: [PHP 8.1] Update `is_serialized` function to accept Enums
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 Reporter:  ayeshrajans  |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:
 Severity:  normal       |   Keywords:  php81
  Focuses:               |
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 PHP 8.1 finally brings Enums! It is not backwards compatible with older
 PHP versions, so it will be a long time before we can make a meaningful
 use of it with WordPress.

 While reading #53295 , I had a concern with the WordPress's
 [https://developer.wordpress.org/reference/functions/is_serialized/
 `is_serialized`] function. It tries to meticulously validate a serialized
 string. At the same time, Enums can be serialized, and uses its own
 [https://php.watch/versions/8.1/enums#serialize Serialized text
 representation for Enums]. I think we should update the function to
 account for the new `E` identifier.

 Ticket #53295 suggests to not make a precise validation in the first place
 if it deems safer, but this ticket is more about updating the existing
 rules to accommodate the new symbol.

 Thank you.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53299>
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