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Subject: Re: [PHP-DEV] [Discussion] Implicitly backed enums
In-Reply-To: <ef4476dd-30bd-4efe-a16e-492167924296@bastelstu.be>
Date: Thu, 23 May 2024 13:34:28 -0500
Cc: PHP Internals <internals@lists.php.net>
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Message-ID: <AB5DE4A9-40D5-430E-9514-D32ABC27F055@trowski.com>
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To: =?utf-8?Q?Tim_D=C3=BCsterhus?= <tim@bastelstu.be>
From: aaron@trowski.com (Aaron Piotrowski)


> On May 23, 2024, at 1:20=E2=80=AFPM, Tim D=C3=BCsterhus =
<tim@bastelstu.be> wrote:
>=20
> Hi
>=20
> On 5/22/24 02:48, Aaron Piotrowski wrote:
>> Perhaps not as clean and easy as the functionality being built-in, =
but it gets the job done.
>=20
> I would suggest to use the built-in functionality then.
>=20
> enum cases are literally just class constants, thus you can access =
them via the `constant()` function or the dynamic class constant fetch =
syntax for PHP 8.3+ and check their existence with `defined()`:
>=20
> https://3v4l.org/44goe
>=20
>    <?php
>=20
>    enum ExampleEnum
>    {
>        case ONE;
>        case TWO;
>        case THREE;
>    }
>=20
>    $caseName =3D 'ONE';
>    var_dump(defined(ExampleEnum::class . "::{$caseName}"));
>    var_dump(constant(ExampleEnum::class . "::{$caseName}"));
>    var_dump(ExampleEnum::{$caseName});
>=20
> Outputs:
>=20
>    bool(true)
>    enum(ExampleEnum::ONE)
>    enum(ExampleEnum::ONE)
>=20
> Best regards
> Tim D=C3=BCsterhus

Hey Tim,

This solution is flawed. Not every constant is necessary an enum case. =
It also isn't type-safe or as nice to read as tryFrom() and from() =
static methods.

Cheers,
Aaron Piotrowski=