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[Uid] Add microsecond precision to UUIDv7 and optimize on x64 #21158

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Jun 29, 2025
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[Uid] Add microsecond precision to UUIDv7 and optimize on x64 #21158

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6 changes: 5 additions & 1 deletion components/uid.rst
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Expand Up @@ -120,7 +120,7 @@ sortable (like :ref:`ULIDs <ulid>`). It's more efficient for database indexing
**UUID v7** (UNIX timestamp)

Generates time-ordered UUIDs based on a high-resolution Unix Epoch timestamp
source (the number of milliseconds since midnight 1 Jan 1970 UTC, leap seconds excluded)
source (the number of microseconds since midnight 1 Jan 1970 UTC, leap seconds excluded)
(`read the UUIDv7 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-7>`__).
It's recommended to use this version over UUIDv1 and UUIDv6 because it provides
better entropy (and a more strict chronological order of UUID generation)::
Expand All @@ -130,6 +130,10 @@ better entropy (and a more strict chronological order of UUID generation)::
$uuid = Uuid::v7();
// $uuid is an instance of Symfony\Component\Uid\UuidV7

.. versionadded:: 7.4

In Symfony 7.4, the precision was increased from milliseconds to microseconds.

**UUID v8** (custom)

Provides an RFC-compatible format intended for experimental or vendor-specific use cases
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