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Date: Mon, 15 Jun 2015 21:55:04 +0200
CC: davey@php.net,
 Andrea Faulds <ajf@ajf.me>,
 Stanislav Malyshev <smalyshev@gmail.com>,
 Anatol Belski <ab@php.net>,
 Kalle Sommer Nielsen <kalle@php.net>,
 PHP Internals <internals@lists.php.net>
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References: <CA+9eiLsTzAHZ=r3vPFWbL_ApQb4q-6MPQerJ7ek403KECz1DEg@mail.gmail.com>
To: Dmitry Stogov <dmitry@zend.com>
Subject: Re: [PHP-DEV] Spaceship and NaNs
From: bobwei9@hotmail.com (Bob Weinand)

As far as I know, we made it that way in order to enforce an int return =
type all the time.
int(-1) is indeed the sensible value for this. (Mainly int(0) does not =
work because it'd mean equality and so we're left with int(-1) and =
int(1).)

Just because other comparison ops already return a bool, we can return =
bool(false) there.

Bob

> Am 15.06.2015 um 21:44 schrieb Dmitry Stogov <dmitry@zend.com>:
>=20
> Hi,
>=20
> I found a problem with spaceship operator.
> It doesn't define result for comparison with NaN.
>=20
> $ sapi/cli/php -r 'var_dump(sqrt(-1) <=3D> 0);'
> int(-1)
> $ sapi/cli/php -r 'var_dump(0 <=3D> sqrt(-1));'
> int(-1)
>=20
> $ sapi/cli/php -r 'var_dump(0 < sqrt(-1));'
> bool(false)
>=20
> all other comparison operators return "false" as well.
>=20
> Thanks. Dmitry.