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Date: Mon, 3 Sep 2012 13:46:32 -0400
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To: Andrew Faulds <ajf@ajf.me>
Cc: Derick Rethans <derick@php.net>, Laruence <laruence@php.net>, 
	Jared Williams <jared.williams@ntlworld.com>, internals@lists.php.net
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: [PHP-DEV] Foreach list behaviour
From: theanomaly.is@gmail.com (Sherif Ramadan)

On Mon, Sep 3, 2012 at 1:36 PM, Andrew Faulds <ajf@ajf.me> wrote:
> On 03/09/12 18:35, Sherif Ramadan wrote:
>>
>> On Mon, Sep 3, 2012 at 4:20 AM, Derick Rethans <derick@php.net> wrote:
>>>
>>> Ew, that's quite nasty (in both cases). Is there a way how we could turn
>>> those into a notice or so?
>>>
>>> cheers,
>>> Derick
>>>
>> Sorry, hit reply instead of reply-all...
>>
>> list($a,$b) = 1;
>> var_dump($a,$b);
>> /*
>> NULL
>> NULL
>> */
>>
>> This doesn't throw notices anywhere else... why should it throw
>> notices in foreach? I guess the only logical answer would be to notify
>> you if you were using scalar values with foreach and list, but then we
>> don't notify you if you're using scalar values with list anywhere else
>> in the language anyway. I'm starting to see huge inconsistencies with
>> how list is being implemented in foreach.
>>
> Possibly more importantly, since 1 should cast to, er, [1] (I think...), why
> is $a === NULL?
>
> --
> Andrew Faulds
> http://ajf.me/
>


It should absolute not cast anything. list($a, $b) = $c; is the
equivalent of saying $a = $c[0]; $b = $c[1]; In this case $c just
happens to be a scalar value and as such you can not derive anything
from the scalar value in that context. It is implicitly null.