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Date: Fri, 23 Jan 2015 00:22:04 +0000
Cc: PHP internals <internals@lists.php.net>
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To: Yasuo Ohgaki <yohgaki@ohgaki.net>
Subject: Re: [PHP-DEV] [RFC] Combined Comparison (Spaceship) Operator
From: ajf@ajf.me (Andrea Faulds)

Hey Yasuo,

> On 23 Jan 2015, at 00:07, Yasuo Ohgaki <yohgaki@ohgaki.net> wrote:
>=20
> Ruby has it. Semantics is the same.
> http://ruby-doc.org/core-1.9.3/Comparable.html
>=20
> PERL has it. Semantics is the same.
> =
http://perldoc.perl.org/perlop.html#Operator-Precedence-and-Associativity

Yep, and I mentioned as much. It=E2=80=99s also in Groovy, but it=E2=80=99=
s not as well-known a language.

> Python has similar "<>", but it only compares equality. (the same as =
!=3D,
> !=3D=3D)

Actually, PHP also has <> (as do one or two other languages). I think =
it=E2=80=99s a relic of BASIC, which had =3D for equality and <> for =
inequality. I don=E2=80=99t think it=E2=80=99s used terribly much by the =
user base.

> MySQL has it. Different differs. It's for NULL comparison.
> =
http://dev.mysql.com/doc/refman/5.6/en/comparison-operators.html#operator_=
equal-to

Yeah, I=E2=80=99m aware of that. I think this is the one case that might =
cause confusion, since MySQL and PHP are used together so often. The =
manual could have a note on it, I suppose.

> There is no reason not to have it, it seems.
> I suggest to add Ruby/PERL operator link to the RFC.

Good idea, I=E2=80=99ve done that now (I chose a slightly better link =
for Perl). I=E2=80=99ve also linked to the Wikipedia article about the =
operator.

> I would like to name it other than T_SPACESHIP.

There=E2=80=99s a case for that possibly=E2=80=A6 I don=E2=80=99t think =
the fancy name hurts much. The syntax error output includes the token =
name, and it has the same name in some other languages. It wouldn=E2=80=99=
t be like Paamayim Nekudotayim, which is a name PHP and only PHP has =
ever used.=20

Thanks.
--
Andrea Faulds
http://ajf.me/