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Date: Mon, 28 Jul 2025 15:04:01 +0200
Message-ID: <CAMU7irKnPsn=xDXCW+OngKJBsRxJ8R_-VQWGoL9v4fjmxL=XVA@mail.gmail.com>
Subject: Re: [PHP-DEV] [DISCUSSION] Adding the "is_integer_safe()" function
To: Claude Pache <claude.pache@gmail.com>
Cc: "Rowan Tommins [IMSoP]" <imsop.php@rwec.co.uk>, internals@lists.php.net
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From: alex.daubois+php@gmail.com (Alexandre Daubois)

Le lun. 28 juil. 2025 =C3=A0 12:18, Claude Pache <claude.pache@gmail.com> a=
 =C3=A9crit :
> This is not correct: 2**53 + 1 is perfectly =E2=80=9Csafe=E2=80=9D (for 6=
4-bit builds of PHP), see: https://3v4l.org/P939d
>
> The specific notion of =E2=80=9Csafe integer=E2=80=9D as introduced in Ja=
vaScript makes sense only for numbers encoded using IEEE 754, which is what=
 PHP uses for `float`. In PHP, there is a specialised type for integers, so=
 that the need of such a function is not clear, because every integer encod=
ed as `int` is =E2=80=9Csafe=E2=80=9D. Or maybe you want something like `is=
_safe_integer_when_interpreted_as_float()`?
>
> Also, note that the particular Symfony example given at the beginning of =
this thread uses a function that expects a string, not an int or a float. I=
n that example, something like `is_numeric_value_producing_exact_integer_wh=
en_interpreted_as_float()` could have been useful, but this use case is ver=
y specialised.
>
> =E2=80=94Claude

Right! I think we found Gina proposed a nice alternative. I wrote a
few specs in my last thread message in response to Gina. Please let me
know if there's something that is unclear or bothering you.

Best,
Alexandre Daubois