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Message-ID: <DAF0E4A2-736A-4176-8DCD-CD78E1385040@benramsey.com>
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Date: Mon, 16 Mar 2020 11:16:55 -0500
In-Reply-To: <CAKtGGAuxkoS9vmKqSfpBi2=mpo2L-w8BXv9idTUaOCiTTtq8Gg@mail.gmail.com>
Cc: PHP internals <internals@lists.php.net>
To: Aran Reeks <cdtreeks@gmail.com>
References: <CAKtGGAuxkoS9vmKqSfpBi2=mpo2L-w8BXv9idTUaOCiTTtq8Gg@mail.gmail.com>
Subject: Re: [PHP-DEV] [DISCUSSION] Native UUID support in PHP
From: ben@benramsey.com (Ben Ramsey)

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> On Mar 16, 2020, at 11:06, Aran Reeks <cdtreeks@gmail.com> wrote:
>=20
> Hi Internals,
>=20
> I'd like to open up a discussion around the implementation of a new
> function within PHP for generating a UUID.
>=20
> Whilst there are libraries out there already for PHP which can =
generate a
> UUID, all of those libraries have the possibility to generate IDs that
> *could* have a collision.
>=20
> The specification for UUID versions 1 and 2 allow for collision-free =
ID
> generation by incorporating the unique MAC addresses from network =
cards -
> something which can't be accessed from PHP code at present.
>=20
> I can see two possible methods to enable this;
>=20
>   - New function added to PHP which exposes the MAC address (allowing
>   external implementations for UUIDs, as well as other possible =
purposes a
>   MAC address could be used).
>=20
>   - A new PHP function which introduced a uuid() function which will
>   generate and return version-compliant UUIDs.
>=20
>   - Both of the above.
>=20
> Thoughts and feedback welcome to kickstart conversations and if =
there's a
> positive consensus, I'd like to put forward an RFC for this to be
> introduced in PHP 8.
>=20


While undocumented, PHP has the method `net_get_interfaces()` (since PHP =
7.3.0).  It uses `getifaddrs()` on Linux and `GetAdaptersAddresses()` on =
Windows to create an array of network interface addresses.

See =
https://github.com/php/php-src/commit/7ca5a7d84ebdc1b97f49cb460f200db093b9=
6d9d

Right now, the address is only added when it is an IPv4 or IPv6 address. =
It just needs to be modified to look for the correct =E2=80=9Cfamily=E2=80=
=9D and set that as the =E2=80=9Cmac=E2=80=9D array value for the =
interface.

I=E2=80=99m currently working on a patch for this, so this might help =
with one aspect of your proposal.

Cheers,
Ben


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