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Array behaviour change intentional?

php.internals

Lars Torben Wilson

23 years ago

Hi there,

It seems that array appending has changed wrt negative indices. I had
just documented the new behaviour but now I'm not entirely sure whether
I've just documented an unintentional change. Is this new behaviour what
is desired (i.e. skipping straight from some negative key to 0 when
appending with $arr[] = <expr>).



Thanks for any insight,


Torben


Test script:
<?php
$arr[-5] = "minus five";
$arr[] = "minus four";
var_dump($arr);
?>


Output PHP 4.2.1:
array(2) {
[-5]=>
string(10) "minus five"
[-4]=>
string(10) "minus four"
}


Output PHP 4.3.2:
array(2) {
[-5]=>
string(10) "minus five"
[0]=>
string(10) "minus four"
}

--
Torben Wilson <torben@php.net>                        +1.604.709.0506
http://www.thebuttlesschaps.com          http://www.inflatableeye.com
http://www.hybrid17.com                  http://www.themainonmain.com
-----==== Boycott Starbucks!  http://www.haidabuckscafe.com ====-----

Jani Taskinen

23 years ago

On Sat, 21 Jun 2003, Lars Torben Wilson wrote:

>Hi there,
>
>It seems that array appending has changed wrt negative indices. I had
>just documented the new behaviour but now I'm not entirely sure whether
>I've just documented an unintentional change. Is this new behaviour what
>is desired (i.e. skipping straight from some negative key to 0 when
>appending with $arr[] = <expr>).
>
>
>
>Thanks for any insight,
>
>
>Torben
>
>
>Test script:
><?php
>$arr[-5] = "minus five";
>$arr[] = "minus four";
>var_dump($arr);
>?>
>
>
>Output PHP 4.2.1:
>array(2) {
>  [-5]=>
>  string(10) "minus five"
>  [-4]=>
>  string(10) "minus four"
>}

Output PHP 4.2.3:
array(2) {
[-5]=>
string(10) "minus five"
[-4]=>
string(10) "minus four"
}

Output PHP 4.3.1:
array(2) {
[-5]=>
string(10) "minus five"
[0]=>
string(10) "minus four"
}

>
>Output PHP 4.3.2:
>array(2) {
>  [-5]=>
>  string(10) "minus five"
>  [0]=>
>  string(10) "minus four"
>}

Seems to have been changed in between 4.2.3 and 4.3.0.
There is/was some bug reports about this too, iirc.

Not very critical, I don't think there are that many scripts
using this?

--Jani

Lars Torben Wilson

23 years ago

On Tue, 2003-06-24 at 08:35, Jani Taskinen wrote:

> On Sat, 21 Jun 2003, Lars Torben Wilson wrote:
>
> >Hi there,
> >
> >It seems that array appending has changed wrt negative indices. I had
> >just documented the new behaviour but now I'm not entirely sure whether
> >I've just documented an unintentional change. Is this new behaviour what
> >is desired (i.e. skipping straight from some negative key to 0 when
> >appending with $arr[] = <expr>).

>     Seems to have been changed in between 4.2.3 and 4.3.0.
>     There is/was some bug reports about this too, iirc.
>
>     Not very critical, I don't think there are that many scripts
>     using this?
>
>     --Jani

Probably not--but there are enough for people to have noticed and
complained.

At the very least it's hard to document the correct behaviour. :)
Essentially I just need to know what to write in the docs, because at
the moment we don't know what the intended behaviour is. Should I just
write that the behaviour of negative indices is undefined, as you
appear to be implying (i.e. unimportant and therefore possibly changing
at random?)

--
Torben Wilson <torben@php.net>                        +1.604.709.0506
http://www.thebuttlesschaps.com          http://www.inflatableeye.com
http://www.hybrid17.com                  http://www.themainonmain.com
-----==== Boycott Starbucks!  http://www.haidabuckscafe.com ====-----