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Message-ID: <F8DA6887-673D-43A9-9837-2DAE4F7E2073@gmail.com>
Cc: Ferenc Kovacs <tyra3l@gmail.com>,
 "internals@lists.php.net" <internals@lists.php.net>
Date: Sat, 1 Sep 2012 11:59:53 +0800
To: Rasmus Schultz <rasmus@mindplay.dk>
Subject: Re: [PHP-DEV] Support negative indexes for arrays and strings
From: tjerk.meesters@gmail.com (Tjerk Meesters)


On 1 Sep, 2012, at 1:11 AM, Rasmus Schultz <rasmus@mindplay.dk> wrote:

> Yes, typo! sorry.
>=20
>     $array =3D array(1001, 1002, 1003, 1004);
>     $number =3D $array[-1]; // =3D> 1004
>     $array[-1] =3D 1005;
>     $number =3D $array[-1]; // =3D> ????
>=20
> Looking at the resulting code, I would like to point out also that
> it's extremely misleading... because $array[-1] references two
> completely different elements depending on whether you're reading or
> writing the value... unless $array[-1] =3D 1005 would actually overwrite
> the last element in the array - in which case it gets even more
> dangerous, as well as breaking backwards compatibility...

That might actually be something I could use :) But the fun for me begins he=
re:

$numbers =3D array();
$numbers[-1] =3D 5;
$numbers[] =3D 6;

What would have happened to the keys? Normally [] is equivalent to [count($n=
umbers)].=20

Perhaps this is why JS treats negative indices as properties instead :)

>=20
>=20
> On Fri, Aug 31, 2012 at 9:24 AM, Ferenc Kovacs <tyra3l@gmail.com> wrote:
>>=20
>>=20
>> On Fri, Aug 31, 2012 at 3:14 PM, Rasmus Schultz <rasmus@mindplay.dk> wrot=
e:
>>>=20
>>> Having thought about this for a while, I think this is a bad idea - here=
's
>>> why:
>>>=20
>>>    $array =3D array(1001, 1002, 1003, 1004);
>>>=20
>>>    $number =3D $array[-1]; // =3D> 1004
>>>=20
>>>    $number[-1] =3D 1005;
>>>=20
>>>    $number =3D $array[-1]; // =3D> ????
>>>=20
>>> Obviously, the last statement must return 1005, since otherwise that
>>> value would be inaccessible.
>>>=20
>>=20
>> maybe you wanted to write
>> $array[-1] =3D 1005;
>> instead of
>> $number[-1] =3D 1005;
>> ?
>>=20
>> otherwise I can't see the problem that you are mentioning.
>> could you clarify?
>>=20
>> --
>> Ferenc Kov=A8=A2cs
>> @Tyr43l - http://tyrael.hu
>=20
> --=20
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>=20