Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:70609
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain ajf.me designates 198.187.29.240 as permitted sender)
Message-ID: <52AA1D9C.9010306@ajf.me>
Date: Thu, 12 Dec 2013 20:33:32 +0000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
MIME-Version: 1.0
To: Adam Harvey <aharvey@php.net>
CC: PHP internals <internals@lists.php.net>
References: <52AA1649.2090601@ajf.me> <CADajX4At9fujWZrTxAT5SivbhHWGdj2NewJ65Qd_rT-y13H+pg@mail.gmail.com>
In-Reply-To: <CADajX4At9fujWZrTxAT5SivbhHWGdj2NewJ65Qd_rT-y13H+pg@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] [PROPOSAL] Alphanumeric decrement
From: ajf@ajf.me (Andrea Faulds)



On 12/12/13 20:19, Adam Harvey wrote:
>
> I wonder if we'd want to warn when 'a' decrements to 0, since it's a
> somewhat unintuitive behaviour. (Also, since Perl will decrement 'a'
> to -1 and Perl was the original inspiration, do we want to decrement
> to -1 as well for consistency?)
>

Ooh, I didn't know about Perl's -1 behaviour. That might be a better 
idea, since "z" becoming "aa" suggests that "a" is functions more like 0 
here than 1. That, or the warning you suggest.

Also, I forgot to mention in my original post, but there is another 
thing changed by this patch. At present, when decrementing a string, it 
is treated as an integer zero if it is empty. This patch also removes 
that check. This brings incrementing into line with decrementing. "" 
would increment to "1" and decrement to "-1", while at present it 
decrements to -1 (the integer).
-- 
Andrea Faulds
http://ajf.me/