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Date: Wed, 3 Apr 2019 13:50:25 +0200
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Subject: Re: [PHP-DEV] PHP_FLOAT_MIN is positive
From: mike@php.net (Michael Wallner)

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From: Michael Wallner <mike@php.net>
To: internals@lists.php.net
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Subject: Re: [PHP-DEV] PHP_FLOAT_MIN is positive
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On 03/04/2019 12:27, Diogo Neves wrote:
> It really don't make much sense:
>=20
> <?php
>=20
> var_dump( PHP_FLOAT_MIN < 0 );
> var_dump( PHP_INT_MIN < 0 );
>=20
> On Wed, Apr 3, 2019 at 10:52 AM Benjamin Morel <benjamin.morel@gmail.co=
m>
> wrote:
>=20
>> Hi internals,
>>
>> I just used PHP_FLOAT_MIN for the first time, and was surprised that i=
t is
>> the smallest **positive** number representable. Is this expected?
>>
>> This is unlike PHP_INT_MIN, which is the absolute smallest representab=
le
>> integer, and as such is negative:
>>
>> echo PHP_INT_MIN; // -9223372036854775808
>> echo PHP_FLOAT_MIN; // 2.2250738585072E-308
>>
>> If it is intended, maybe the doc
>> <https://www.php.net/manual/en/reserved.constants.php> should be clear=

>> about this, at the moment it is just:
>>
>> Smallest representable floating point number.
>>
>>
>> Which is confusing IMO.

FLT_MIN is the smallest real near 0. Are you looking for -FLT_MAX?
With IEEE754 floats, there are positive and negative zeros, so the range
above and below 0 is the same.


--=20
Regards,
Mike


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