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Date: Thu, 18 Jul 2013 13:22:49 -0600
Message-ID: <CAAjMSDMxUJoxU0wPGbBu6RwobYw2HgVD67hKJQpARgsSjaL0Dg@mail.gmail.com>
To: Phil Sturgeon <email@philsturgeon.co.uk>
Cc: Martin Amps <php_m@rtin.so>, Xinchen Hui <laruence@gmail.com>, 
	Mateusz Kocielski <shm@digitalsun.pl>, "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=089e0149331ec12d2204e1ce227c
Subject: Re: [PHP-DEV] Feature Proposal: Allow letter decrementing
From: me@chrislondon.co (Chris London)

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The one caveat about decrementing "A" and it goes to NULL is that if you
increment NULL it goes to 1 so that may be confusing.  We could also
decrement "A" and it goes to FALSE and FALSE++ is still FALSE


On Thu, Jul 18, 2013 at 1:10 PM, Phil Sturgeon <email@philsturgeon.co.uk>wr=
ote:

>  Incrementing "Z" results in "AA", because we're starting again.
> Decrementing "A" should probably go to NULL as -A is no good.
>
> --
> Phil Sturgeon
>
> On Thursday, July 18, 2013 at 3:08 PM, Martin Amps wrote:
>
> One hiccup. I imagine maybe the reason we don't support decrementing is
> because what would happen if you tried to decrement 'A'. In that case I
> would suggest either returning NULL or throwing a notice.
>
>
> It would make sense to make it stay as =E2=80=98A=E2=80=99 like increment=
ing =E2=80=98Z' stays as
> =E2=80=98Z=E2=80=99.
>
> I do agree that string manipulation with arithmetic operators needs
> work/clarification.
>
> On Jul 18, 2013, at 7:37 AM, Xinchen Hui <laruence@gmail.com> wrote:
>
> =E5=9C=A8 2013-7-18=EF=BC=8C22:31=EF=BC=8CMateusz Kocielski <shm@digitals=
un.pl> =E5=86=99=E9=81=93=EF=BC=9A
>
> It seems logical that if we support increment we should support decrement=
.
>
>
> My proposal:
>
>
> 1) Support decrementing letters
>
> - or -
>
> 2) Throw a notice explaining that decrementing is not supported so
>
> developers quickly know they can't do that
>
>
> One hiccup. I imagine maybe the reason we don't support decrementing is
>
> because what would happen if you tried to decrement 'A'. In that case I
>
> would suggest either returning NULL or throwing a notice.
>
>
> Thanks for the input
>
>
> Chris London
>
>
> Hello,
>
> Does anybody understand the rules behind the string incrementation? What'=
s
> the explanation of following behaviour?
>
> '$x=3D"ZZ";$x++;var_dump($x);' returns string(3) "AAA"
> '$x=3D" ZZ";$x++;var_dump($x);' returns string(3) " AA"
>
> see http://www.php.net/manual/en/language.operators.increment.php
>
> thanks
>
> Regards,
> Mateusz Kocielski
>
>
>

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