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To: "Nikita Popov" <nikita.ppv@gmail.com>
Cc: "PHP internals" <internals@lists.php.net>
References: <CAF+90c8m8kMNjHOOKWs3iTxnLSVv41pk0mGjgzvvp2+Lieh+ig@mail.gmail.com> <op.xf0ptinpc9evq2@nikita-pc> <CAF+90c8hoG3QKx8fej=4p2PQhcoMF=1r69mxRfZD+WCWottPzQ@mail.gmail.com>
Date: Sat, 17 May 2014 23:38:01 +0400
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Subject: Re: [PHP-DEV] Rethinking 64bit sizes and PHP-NG
From: inefedor@gmail.com ("Nikita Nefedov")

On Sat, 17 May 2014 23:11:13 +0400, Nikita Popov <nikita.ppv@gmail.com>  
wrote:

> On Sat, May 17, 2014 at 9:01 PM, Nikita Nefedov <inefedor@gmail.com>  
> wrote:
>
>>
>> Hey,
>>
>>
>>
>> First thank you for arranging all this points.
>>
>>
>>
>> I just wanted to ask: could we also make nNextFreeElement be unsigned?  
>> Because with your proposal it >>would be possible to overflow it with  
>> the code like this: $array[pow(2, 32) + 1] = 123; (if I understand >>it  
>> correctly)
>>
>>
>>
>>
>> And besides that we can't have negative keys anyway.
>
> PHP arrays store integral keys larger than PHP_INT_MAX as a string  
> rather than an integer. Auto->incrementing does not work past that  
> point. If you write something like this...
>
>
>    $array[PHP_INT_MAX] = 42;
>    $array[] = 43;
>
> ...you'll receive an error (this is intentional). You get that error  
> because the code explicitly makes >sure that nNextFreeElement can never  
> overflow. (Here is an example of such an overflow check:  
> http://>lxr.php.net/xref/PHP_TRUNK/Zend/zend_hash.c#435).
>
>
> Nikita
>

Ah well, my fault didn't see it :)