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Message-ID: <96314450-2508-8328-34cb-b2eb989ae337@heigl.org>
Date: Tue, 18 Feb 2020 13:03:09 +0100
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Subject: Re: [PHP-DEV] Make var_dump() use serialize_precision
From: andreas@heigl.org (Andreas Heigl)

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Am 18.02.20 um 12:20 schrieb Nikita Popov:
> Hi internals,
>=20
> https://github.com/php/php-src/pull/5172 changes var_dump() to use
> serialize_precision instead of precision to dump floating-point numbers=
=2E
>=20
> To recap: serialize_precision defaults to -1, which will print exactly =
as
> many floating-point digits as are needed to represent the number
> accurately. precision defaults to 14, which will print a shorter but
> potentially inaccurate float representation.
>=20
> The motivation here is that var_dump() is debugging functionality and
> should print values as accurately as possible. The single most common b=
ug
> report we receive is some kind of variation on:
>=20
>     $sum =3D 0.1 + 0.2;
>     var_dump($sum); // float(0.3)
>     var_dump($sum =3D=3D 0.3); // bool(false) WTF???
>=20
> After this change, this would instead be:
>=20
>     $sum =3D 0.1 + 0.2;
>     var_dump($sum); // float(0.30000000000000004)
>     var_dump($sum =3D=3D 0.3); // bool(false) Makes sense...
>=20
> I have little hope that developers will suddenly start understanding
> floating-point numbers, but at least this should reduce the amount of
> confusion.
>=20
> Does anyone see an issue with doing this change?

You mean apart from people now filing bugs how var_dump() can output
such a nonsensical number from such an easy equation? And that it again
shows that PHP is not a real programming language (unlike JavaScript)
and should never be used at all?

Nope ;-)

Cheers

Andreas

PS: I'd absolutely appreciate the change!!!
--=20
                                                              ,,,
                                                             (o o)
+---------------------------------------------------------ooO-(_)-Ooo-+
| Andreas Heigl                                                       |
| mailto:andreas@heigl.org                  N 50=C2=B022'59.5" E 08=C2=B0=
23'58" |
| http://andreas.heigl.org                       http://hei.gl/wiFKy7 |
+---------------------------------------------------------------------+
| http://hei.gl/root-ca                                               |
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