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php-uuid/docs/reference/variant.rst
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2025-06-01 01:20:09 -05:00

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.. _reference.variant:
=======
Variant
=======
.. php:namespace:: Ramsey\Uuid
.. php:enum:: Variant : int
The variant number describes the layout of the UUID. UUIDs generated according to the layout defined in `RFC 9562`_
(formerly `RFC 4122`_) will always have a variant value set to ``2``. In ramsey/uuid, this is the enum value
:php:case:`Ramsey\\Uuid\\Variant::Rfc9562`.
.. php:case:: ReservedNcs : 0
Reserved for NCS backward compatibility.
.. php:case:: Rfc9562 : 2
The `RFC 9562`_ (formerly `RFC 4122`_) variant.
.. php:case:: ReservedMicrosoft : 6
Reserved for Microsoft Corporation backward compatibility.
.. php:case:: ReservedFuture : 7
Reserved for future definition.
.. php:const:: Rfc4122
This is an alias for :php:case:`Ramsey\\Uuid\\Variant::Rfc9562`.
.. _RFC 4122: https://www.rfc-editor.org/rfc/rfc4122
.. _RFC 9562: https://www.rfc-editor.org/rfc/rfc9562