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Date: Thu, 25 Dec 2014 12:34:38 +0800
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To: Andrea Faulds <ajf@ajf.me>
Cc: Levi Morrison <levim@php.net>, =?UTF-8?Q?Johannes_Schl=C3=BCter?= <johannes@schlueters.de>, 
	Pierre Joye <pierre.php@gmail.com>, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] About SUCCESS/FAILURE
From: laruence@php.net (Xinchen Hui)

Hey:

On Thu, Dec 25, 2014 at 12:06 PM, Andrea Faulds <ajf@ajf.me> wrote:
>
>> On 24 Dec 2014, at 23:53, Levi Morrison <levim@php.net> wrote:
>>
>> On Wed, Dec 24, 2014 at 4:27 PM, Johannes Schl=C3=BCter
>> <johannes@schlueters.de> wrote:
>>> On Wed, 2014-12-24 at 11:13 -0700, Levi Morrison wrote:
>>>
>>>> I'm asking for specific things. The reason is that some API's do a
>>>> non-zero error code; the fact that they are negative is a detail that
>>>> we should not need to care about.
>>>
>>> My guess is that positive values more often might have a meaning ("5
>>> items changed", "address 0x1234") whereas negative values less often
>>> have a meaning. Also passing -1 as parameter is more often invalid. Thu=
s
>>> passing -1 is making debug output look more suspicious.
>>>
>>>        (while there are  cases where -1 is valid, see recent famous pid
>>>        =3D fork(); /* ... */ kill(pid, SIGKILL); issue)
>>
>> I don't think this is the same use case as SUCCESS and FAILURE. Many
>> functions have an out parameter which is only valid when the returned
>> value is SUCCESS. This is not the same thing as an API which returns
>> an integer and just happen to embed error state in the negative range.
>> Notably, it doesn't make sense to do `strpos() =3D=3D SUCCESS` to check
>> success; these are different cases. My question is specifically
>> directed at the ones that use SUCCESS and FAILURE: which ones require
>> FAILURE to be negative instead of the normal UNIX-ism of non-zero?
>>
>> For the record I am in favor of an enum such as `zend_status` or some
>> other name which indicates whether an operation succeeded or not for
>> the reasons already cited in this thread. I just don't see why FAILURE
>> needs to be negative and want to know why this is the case.
>
> Hi Levi,
>
> Again, I think the reason FAILURE is -1 is for consistency with other fun=
ctions which use negative return values on error. Some functions return neg=
ative error codes, others just -1. Some functions return useful positive va=
lues, others just 0. But the idea is that all functions return a negative n=
umber on error, so you can use if (foo() < 0) to check for errors. That=E2=
=80=99s the point of making FAILURE be -1, AIUI. It makes it consistent wit=
h other things, like fork() or strpos().
>
> Thanks.
lets make this simple.

first we need unify PHP self..

thanks
>
> --
> Andrea Faulds
> http://ajf.me/
>
>
>
>



--=20
Xinchen Hui
@Laruence
http://www.laruence.com/