Symfony version(s) affected

5.x, 6.x

Description

As of PHP 7.4.6 (doctrine/common#886 (comment)), PHP's serialize function ignores uninitialized properties and no longer triggers an error. The same change was not (yet) made in igbinary's igbinary_serialize, there is a ticket to change this though.

Symfony Cache DefaultMarshaller still treats igbinary_serialize as a drop-in replacement for serialize but this is no longer true. Trying to serialize entities with igbinary installed now results in the same error we used to get with serialize.

Typed property Proxies_CG_\App\Entity\EntityName::$ must not be accessed before initialization (in __sleep)

How to reproduce

Serialize an object with an uninitialised property through Symfony cache with the default marshaller config.

Possible Solution

It is possible to disable igbinary through the cache.default_marshaller service but Symfony may want to consider disabling it by default as it no longer is a drop-in replacement.

Additional Context

No response