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Fix for bug #28325

php.internals

Moriyoshi Koizumi

22 years ago

I made a patch for bug #28325.
I'd like to see this one applied by the time PHP5 gets out of the door.

http://www.voltex.jp/patches/bug28325-preliminary.patch.diff

Regards,
Moriyoshi

Andi Gutmans

22 years ago

Hi Moriyoshi,

The object handle is not a unique identifier. Different object types (e.g.
PHP objects, SimpleXML objects) can have the same object handle. The real
unique identifier is object handle + object handlers array or more useful
in your case, possibly class name and object handle.

Andi


At 12:06 PM 6/30/2004 +0900, Moriyoshi Koizumi wrote:

Moriyoshi Koizumi

22 years ago

On 2004/07/01, at 14:25, Andi Gutmans wrote:

> Hi Moriyoshi,
>
> The object handle is not a unique identifier. Different object types
> (e.g. PHP objects, SimpleXML objects) can have the same object handle.
> The real unique identifier is object handle + object handlers array or
> more useful in your case, possibly class name and object handle.

Thanks for the advice. So, will object handle + the VM address to the
class entry suffice either?

Moriyoshi

Sterling Hughes

22 years ago

this would still not suffice for a proper serialization, overloaded
objects should have serialize and unserialize handlers....  something
for 5.1 methinks.

-sterling

On Thu, 1 Jul 2004 16:03:09 +0900, Moriyoshi Koizumi
<moriyoshi@at.wakwak.com> wrote:

Marcus Börger

22 years ago

Hello Sterling,

i have that on my personal 5.1 todo list since months...

marcus

Thursday, July 1, 2004, 6:29:53 PM, you wrote:

> this would still not suffice for a proper serialization, overloaded
> objects should have serialize and unserialize handlers....  something
> for 5.1 methinks.

> -sterling

> On Thu, 1 Jul 2004 16:03:09 +0900, Moriyoshi Koizumi
> <moriyoshi@at.wakwak.com> wrote:
>>
>>
>> On 2004/07/01, at 14:25, Andi Gutmans wrote:
>>
>> > Hi Moriyoshi,
>> >
>> > The object handle is not a unique identifier. Different object types
>> > (e.g. PHP objects, SimpleXML objects) can have the same object handle.
>> > The real unique identifier is object handle + object handlers array or
>> > more useful in your case, possibly class name and object handle.
>>
>> Thanks for the advice. So, will object handle + the VM address to the
>> class entry suffice either?
>>
>>
>>
>> Moriyoshi
>>
>> --
>> PHP Internals - PHP Runtime Development Mailing List
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>>
>>

--
Best regards,
Marcus                            mailto:helly@php.net

Andi Gutmans

22 years ago

Yeah it might make sense to think of something like that.
What does serializing a SimpleXML object do today?
Andi

At 09:29 AM 7/1/2004 -0700, Sterling Hughes wrote:

Moriyoshi Koizumi

22 years ago

This is the new one. Hope it is ready to commit this time.

http://www.voltex.jp/patches/bug28325-preliminary-20040701.patch.diff

Two untidy bitshifts are intended to form an atomic bit rotation and
are somewhat necessary for the uniqueness of the hash value.
At least 31 object handles of the same class can rarely be
recognised wrongly with this code as long as blk (or mmap) call is sane
and it properly maps the physical memory to the VM space.

Moriyoshi

On 2004/07/01, at 16:03, Moriyoshi Koizumi wrote:

Sebastian Bergmann

22 years ago

Andi Gutmans wrote:

> The object handle is not a unique identifier.

Are there any plans on implementing a really unique identifier to
objects? This would, among other things, allow objects to be used as
array keys.

--
Sebastian Bergmann
http://sebastian-bergmann.de/                   http://phpOpenTracker.de/

Das Buch zu PHP 5: http://professionelle-softwareentwicklung-mit-php5.de/