Re: Feature Proposal: Allow letter decrementing
| From: | Martin Amps | Date: | Thu, 18 Jul 2013 19:08:56 +0000 |
| Subject: | Re: Feature Proposal: Allow letter decrementing | ||
| References: | 1 2 3 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-68165@lists.php.net to get a copy of this message | ||
> 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 ‘A’ like incrementing ‘Z' stays as ‘Z’.
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:
> 在 2013-7-18，22:31，Mateusz Kocielski <shm@digitalsun.pl> 写道：
>
> 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?
>
> '$x="ZZ";$x++;var_dump($x);' returns string(3) "AAA"
> '$x=" ZZ";$x++;var_dump($x);' returns string(3) " AA"
>
> see 䣝
> vEphttp://www.php.net/manual/en/language.operators.increment.php
>
> thanks
>
> Regards,
> Mateusz Kocielski