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Subject: Re: [PHP-DEV] New function: spl_object_id() or spl_object_handle()
From: rowan.collins@gmail.com (Rowan Collins)

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Nicolas Grekas wrote on 09/12/2014 14:39:
> Hi Rowan,
>
>         In order to get an object's id, I use a trick that works for now:
>         https://github.com/symfony/symfony/blob/2.6/src/Symfony/Component/VarDumper/Cloner/VarCloner.php#L258-L282
>
>
>     This seems like a very elaborate piece of reverse engineering
>
>
> Right, and I made the claim for this being a trick :)
>
> Still: the exact value is not what I'm most interested in you're right 
> (but it provides rought information about the number of objects 
> currently allocated which might be useful sometimes).
>
> The gain is displaying a shortest possible number. I could rehash 
> you're right, but then I'll have collisions. Both arguments 
> (short+unique number) are relevant when debugging/dumping.

Yes, I think a version of spl_object_hash that was more human-readable 
would be a sensible move. IMHO, it would not be a BC break to completely 
change the output, since the documentation makes no promises about it, 
and reverse-engineered code like yours could just check PHP_VERSION.

>
>
>         https://github.com/symfony/symfony/tree/2.6/src/Symfony/Component/Debug/Resources/ext
>
>
>     The more interesting part of this is the refcount
>
>
> That, plus the fact that it returns the value (instead of writing it 
> to php://output)
> but other returned values are also important, especially zval_hash and 
> zval_isref that allow efficient tracking of hard references.

Indeed. A non-function version of debug_zval_dump which could do this on 
any variable would be even better (if I read it right, your function 
only works on array members?)

-- 
Rowan Collins
[IMSoP]

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