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Date: Thu, 21 Mar 2019 15:39:23 +0100
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To: PHP internals <internals@lists.php.net>
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Subject: Re: Convert ext/xml to use an object instead of resource
From: nikita.ppv@gmail.com (Nikita Popov)

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On Tue, Feb 12, 2019 at 4:00 PM Nikita Popov <nikita.ppv@gmail.com> wrote:

> Hi internals,
>
> The ext/xml extension currently has GC issues, see
> https://bugs.php.net/bug.php?id=76874. The tl;dr is that uses of
> xml_parser will usually result in a cyclic structure, but resources do not
> support cycle GC. This means that the user is required to take care of
> breaking GC cycles manually, which is very unusual for PHP.
>
> I would like to port the xml extension from using a resources towards
> using an object, which is fully GC integrated. This is implemented in
> https://github.com/php/php-src/pull/3526.
>
> An XmlParser class is used instead of a resource. The class is final and
> cannot be manually constructed. It is still used with the normal
> xml_parser_* APIs. This is intended as an internal representation change,
> not a conversion to OO APIs. The xml_parser_free() method becomes
> effectively a no-op and may be deprecated in some future version.
>
> This change is intended for PHP 7.4. While it is technically BC breaking
> (in that code that goes out of the way to use is_resource or similar may
> break), but we've done a couple of these resource->object migration in
> minor versions in the past (ref
> https://wiki.php.net/rfc/operator_overloading_gmp and
> https://wiki.php.net/rfc/hash-context.as-resource).
>
> Any thoughts?
>
> Regards,
> Nikita
>

I'd like to move forward with this. Jakub requested this change to be
postponed to 8.0 in
https://github.com/php/php-src/pull/3526#issuecomment-469796632 to minimize
BC issues. As 8.0 is close I'm okay with just doing that, this is not super
urgent for me.

Is there anything else that needs to be resolved here, or is this good to
go for PHP 8.0?

Nikita

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