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Date: Thu, 12 Oct 2023 11:24:28 -0700
Message-ID: <CAMrTa2H553O1CesPU95ma-HYnejWkMgZf-QOVvCxs=NHMOAc+g@mail.gmail.com>
To: Saki Takamachi <saki@sakiot.com>
Cc: Pierre Joye <pierre.php@gmail.com>, PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC] [Discussion] Adding bcround, bcfloor and bcceil
 to BCMath
From: jordan.ledoux@gmail.com (Jordan LeDoux)

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On Thu, Oct 5, 2023 at 5:27=E2=80=AFAM Saki Takamachi <saki@sakiot.com> wro=
te:

> Hi, Pierre
>
> In fact, I predict that many use cases will be covered by GMP.
>
> Still, I think that there may be cases where calculation functions like
> mainframe BCD are required, such as when calculating money.
>
> I am unable to decide whether it is correct to deprecate BCMath and only
> use GMP.
>
> I'd like to hear other people's opinions as well.
>
> Regards.
>
> Saki
>

GMP cannot be used in any reasonable way to implement things like sin() or
cos(). It is *technically* possible, but not at all reasonable. Now, PHP
doesn't natively support trig functions for anything other than normal
floats, but things like that are exactly the extended capability that my
PHP math library adds. This is required for most statistics, which now HAVE
to be done in PHP itself since the ext-stats extension hasn't been updated
since... I think 7.1?

BCMath is one of the worst and slowest implementations of arbitrary
precision decimals. It absolutely should be replaced. I have explored
creating a new extension to do just this in fact for the express purpose of
deprecating and replacing the bundled BCMath. But GMP, as it is implemented
currently, is not a replacement at all.

Jordan

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