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Date: Tue, 31 Aug 2021 15:56:42 +0200
To: PHP Internals <internals@lists.php.net>
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Organization: FusionDirectory
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Subject: Resources and object resources
From: come.chilliet@fusiondirectory.org (=?UTF-8?B?Q8O0bWU=?= Chilliet)

Hello,

Resources cannot be serialized.
This is mentionned on https://www.php.net/manual/en/function.serialize.php ,
 but one can easily miss it.
The information does not seem to appear on
https://www.php.net/manual/en/language.oop5.serialization.php and
https://www.php.net/manual/en/language.types.resource.php

And nowhere does it says what happens if you serialize an object with a
 resource in a property.

Now most resources are replaced by classes in the recent versions of PHP.
Because of this, it is advised to replace tests like
(is_resource($object->res)) with ($object->res !=3D=3D FALSE).

So, I tried to do this in my application with LDAP connections, which will =
be
objects in PHP 8.1.

And the application broke, because when unserializing from session an object
containting an LDAP connection, the property is set to int(0). So is_resour=
ce()
and !=3D=3D FALSE will not have the same result.

I cannot find any documentation page mentionning that resources are turned =
into
int(0) upon serialization.

It seems to be consistent accross versions: https://3v4l.org/BHtAh

But what will happen when LDAP connections are turned into objects in 8.1? =
Will
they also become int(0) upon serialization or will they behave in an other =
way?
I could not find a case of resource that became an object and is allowed on
3v4l to test this. There is no LDAP or CURL in there.

C=C3=B4me