Bug #79447 [Com]: Serializing uninitialized typed properties with __sleep should not throw

Edit report at https://bugs.php.net/bug.php?id=79447&edit=1 ID: 79447 Comment by: ocramius@php.net Reported by: nicolasgrekas@php.net Summary: Serializing uninitialized typed properties with __sleep should not throw Status: Open Type: Bug Package: Scripting Engine problem PHP Version: 7.4.4 Block user comment: N Private report: N New Comment: We (Doctrine) could return only the initialized properties in __sleep. The only reason __sleep exists in proxies is to avoid serializing the whole ORM and proxy initializer closures (and transitively PDO too), but we could use reflection in __sleep to determine which properties are initialized. The performance impact is acceptable, since we're well out the 80/20 scenario. Overall, the behavior of PHP-SRC makes sense to me, and the added strictness is welcome, so the engine throwing when serialize($somethingWithBrokenSleep) seems correct, although it is indeed a BC break. Previous Comments: ------------------------------------------------------------------------ [2020-04-07 13:00:33] nikic@php.net I have a bit of a hard time following these threads. In the end I didn't understand a) where __sleep is actually defined/generated in the first place and b) why the __sleep returns uninitialized properties. (As a bonus question, can this usage of __sleep be migrated to __serialize?) ------------------------------------------------------------------------ [2020-04-03 15:06:57] nicolasgrekas@php.net Description: ------------ This is a follow up of https://bugs.php.net/bug.php?id=79002 The Symfony+Doctrine community is learning to use uninitialized properties, and we're having a bad time with __sleep(). The behavior implemented in https://github.com/php/php-src/commit/846b6479537a112d1ded725e6484e46462048b35 forbids serializing arbitrary objects (e.g.for hashing purpose). This forces us to catch and ignore "Throwable", which in turn might hide legit errors that ppl do need to see during development. Here is an example issue https://github.com/doctrine/common/issues/886 where this is discussed, originating from https://github.com/doctrine/orm/issues/8030, which in turns generates PRs like https://github.com/symfony/symfony/pull/36336 All this activity would disappear and things would work seamlessly if the engine would just ignore uninitialized properties returned by __sleep(). On unserialize(), such properties should be unserialized back to the "uninitialized" state. This would respect the semantics of serialize/unserialize and would solve all this complexity we don't know how to deal with. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79447&edit=1