Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:67348
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain theunraveler.com designates 67.222.54.6 as permitted sender)
Content-Type: text/plain; charset=iso-8859-1
Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\))
In-Reply-To: <CALFY5ZyyKgmAmhdwi-jdiRToMfTa9dDrZmUxu9ArFjGrV+UL_w@mail.gmail.com>
Date: Tue, 7 May 2013 14:15:08 -0500
Content-Transfer-Encoding: quoted-printable
Message-ID: <73F8DE8F-5AC8-4BBD-B4DE-C4AF1CB37EAB@theunraveler.com>
References: <CAEe4Dn8NUg3V-b2edENHcs6__TK1kx-sW16NiNF7-j9xNG8UMw@mail.gmail.com> <CAF+90c9SjC5D5vMMDTWUcwEGkCtfd93oQ+=qNG03gcL3Xor13A@mail.gmail.com> <CAHpw9AdJrzg2XyKX8xTrTr16nZEDdaqnbyh=FA9zkGiLq1j46w@mail.gmail.com> <CALFY5ZyyKgmAmhdwi-jdiRToMfTa9dDrZmUxu9ArFjGrV+UL_w@mail.gmail.com>
To: PHP internals <internals@lists.php.net>
Subject: Re: [PHP-DEV] idea: implement a Comparable interface
From: jake@theunraveler.com (Jake Bell)

I proposed something similar recently in the PHP-FIG group, but decided =
that without the language-level ability to overload comparison =
operators, standardizing comparables ony using methods was not very =
useful. If PHP could provide a magic method for comparison that involved =
being able to use comparison operators, I think this feature would be =
really useful.

An example that comes to mind is a Money class:

$pesos =3D new Money(200, Money::PESO);
$dollars =3D new Money(100, Money::US_DOLLAR);
var_dump($pesos < $dollars);

Then, the Money class could take care of normalizing and comparing the =
values. Food for thought...

-- Jake

On May 7, 2013, at 1:15 PM, Stuart Langley <slangley@google.com> wrote:

> Classes without the ability to overload the comparison operator could =
be
> considered kinda useless as well.
>=20
>=20
> On Tue, May 7, 2013 at 11:11 AM, Daniel Ribeiro <drgomesp@gmail.com> =
wrote:
>=20
>> Its kinda useless feature for PHP.
>>=20
>>=20
>> Daniel Ribeiro Gomes Pereira
>> Twitter <https://twitter.com/#!/drgomesp> |
>> Facebook<https://www.facebook.com/profile.php?id=3D100000407054469>
>> | LinkedIn =
<http://www.linkedin.com/pub/daniel-ribeiro-gomes/21/414/39>
>> iPhone: +55 (48) 9111-0931
>>=20
>>=20
>> 2013/5/7 Nikita Popov <nikita.ppv@gmail.com>
>>=20
>>> On Tue, May 7, 2013 at 6:17 PM, Thomas Anderson <zelnaga@gmail.com>
>> wrote:
>>>=20
>>>> It'd be nice if, when doing $objA > $objB, that that'd invoke
>>>> $objA->__compareTo($objB) or something, much like Java's Comparable
>>>> interface.
>>>>=20
>>>=20
>>> Do you have examples of what this would be useful for? The two =
things
>> that
>>> come to mind are DateTime (which can do this anyway as it's an =
internal
>>> class) and classes for bignums or something like that (which are =
probably
>>> also better implemented internally). So I'm not sure how much use =
there
>> is
>>> for this.
>>>=20
>>> Nikita
>>>=20
>>=20