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Date: Thu, 18 Jul 2013 12:08:56 -0700
Cc: Mateusz Kocielski <shm@digitalsun.pl>,
 Chris London <me@chrislondon.co>,
 internals@lists.php.net <internals@lists.php.net>
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References: <CAAjMSDNenox+qpPyDW9hKzwk-ZwF_Pszz99jLT36k4XKdELyHw@mail.gmail.com> <CAB16j6_z6zhzbaUUWhAKev95+512_mh4DUpzRDA9xw_Fqnqhvw@mail.gmail.com> <-6008161650538629327@unknownmsgid>
To: Xinchen Hui <laruence@gmail.com>
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Subject: Re: [PHP-DEV] Feature Proposal: Allow letter decrementing
From: php_m@rtin.so (Martin Amps)

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> 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 =
incrementing =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@digitalsun.pl> =E5=86=99=E9=81=93=EF=BC=9A
>=20
> It seems logical that if we support increment we should support =
decrement.
>=20
>=20
> My proposal:
>=20
>=20
> 1) Support decrementing letters
>=20
> - or -
>=20
> 2) Throw a notice explaining that decrementing is not supported so
>=20
> developers quickly know they can't do that
>=20
>=20
> One hiccup. I imagine maybe the reason we don't support decrementing =
is
>=20
> because what would happen if you tried to decrement 'A'. In that case =
I
>=20
> would suggest either returning NULL or throwing a notice.
>=20
>=20
> Thanks for the input
>=20
>=20
> Chris London
>=20
>=20
> Hello,
>=20
> Does anybody understand the rules behind the string incrementation? =
What's
> the explanation of following behaviour?
>=20
> '$x=3D"ZZ";$x++;var_dump($x);' returns string(3) "AAA"
> '$x=3D" ZZ";$x++;var_dump($x);' returns string(3) " AA"
>=20
> see http://www.php.net/manual/en/language.operators.increment.php
>=20
> thanks
>=20
> Regards,
> Mateusz Kocielski


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