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Date: Wed, 21 May 2014 05:45:43 +0900
Message-ID: <CAGa2bXZFiJCasezvuuBc+K67j4W5dCgMVartEUqZrZp+z0JrBA@mail.gmail.com>
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: Arvids Godjuks <arvids.godjuks@gmail.com>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a113470c0152a3a04f9daf935
Subject: Re: [PHP-DEV] Re: 64bit and phpng, votes and plans
From: yohgaki@ohgaki.net (Yasuo Ohgaki)

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Hi Nikita,

On Tue, May 20, 2014 at 4:09 PM, Nikita Popov <nikita.ppv@gmail.com> wrote:

> You can already use a key larger than 32 bits to index an array. The
> limitation only applies if you want to actually store more than 2^32 (or
> 2^31 depending on the exact implementation) elements. That's the beauty of
> a hashtable: The allowed key domain is totally independent of the hashtable
> size ;)
>

Right and wrong.
When key is string, key can be anything. However, when it is int, it's not.

$ php -r '$arr[9999999999999999999999999999999]="abc";var_dump($arr);'
array(1) {
  [-4571153621781053440]=>
  string(3) "abc"
}
$ php -r '$arr["9999999999999999999999999999999"]="abc";var_dump($arr);'
array(1) {
  ["9999999999999999999999999999999"]=>
  string(3) "abc"
}

This is the reason why convert DB data values and Web inputs should not be
converted to native PHP data type blindly :)
It could work, but it cannot with 64bit int.

Regards,

--
Yasuo Ohgaki
yohgaki@ohgaki.net

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