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[Uid] Update some RST syntax#19741

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javiereguiluz merged 1 commit intosymfony:6.4fromjaviereguiluz:tweak_uid_syntax
Apr 4, 2024
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140 changes: 74 additions & 66 deletionscomponents/uid.rst
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Original file line numberDiff line numberDiff line change
Expand Up@@ -30,105 +30,113 @@ Use the named constructors of the ``Uuid`` class or any of the specific classes
to create each type of UUID:

**UUID v1** (time-based)
Generates the UUID using a timestamp and the MAC address of your device
(`read UUIDv1 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-1>`__).
Both are obtained automatically, so you don't have to pass any constructor argument::

use Symfony\Component\Uid\Uuid;
Generates the UUID using a timestamp and the MAC address of your device
(`read UUIDv1 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-1>`__).
Both are obtained automatically, so you don't have to pass any constructor argument::

// $uuid is an instance of Symfony\Component\Uid\UuidV1
$uuid = Uuid::v1();
use Symfony\Component\Uid\Uuid;

// $uuid is an instance of Symfony\Component\Uid\UuidV1
$uuid = Uuid::v1();

.. tip::
.. tip::

It's recommended to use UUIDv7 instead of UUIDv1 because it provides
better entropy.
It's recommended to use UUIDv7 instead of UUIDv1 because it provides
better entropy.

**UUID v2** (DCE security)
Similar to UUIDv1 but with a very high likelihood of ID collision
(`read UUIDv2 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-2>`__).
It's part of the authentication mechanism of DCE (Distributed Computing Environment)
and the UUID includes the POSIX UIDs (user/group ID) of the user who generated it.
This UUID variant is **not implemented** by the Uid component.

Similar to UUIDv1 but with a very high likelihood of ID collision
(`read UUIDv2 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-2>`__).
It's part of the authentication mechanism of DCE (Distributed Computing Environment)
and the UUID includes the POSIX UIDs (user/group ID) of the user who generated it.
This UUID variant is **not implemented** by the Uid component.

**UUID v3** (name-based, MD5)
Generates UUIDs from names that belong, and are unique within, some given namespace
(`read UUIDv3 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-3>`__).
This variant is useful to generate deterministic UUIDs from arbitrary strings.
It works by populating the UUID contents with the``md5`` hash of concatenating
the namespace and the name::

use Symfony\Component\Uid\Uuid;
Generates UUIDs from names that belong, and are unique within, some given namespace
(`read UUIDv3 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-3>`__).
This variant is useful to generate deterministic UUIDs from arbitrary strings.
It works by populating the UUID contents with the``md5`` hash of concatenating
the namespace and the name::

// you can use any of the predefined namespaces...
$namespace = Uuid::fromString(Uuid::NAMESPACE_OID);
// ...or use a random namespace:
// $namespace = Uuid::v4();
use Symfony\Component\Uid\Uuid;

// you can use any of the predefined namespaces...
$namespace = Uuid::fromString(Uuid::NAMESPACE_OID);
// ...or use a random namespace:
// $namespace = Uuid::v4();

// $name can be any arbitrary string
// $uuid is an instance of Symfony\Component\Uid\UuidV3
$uuid = Uuid::v3($namespace, $name);
// $name can be any arbitrary string
// $uuid is an instance of Symfony\Component\Uid\UuidV3
$uuid = Uuid::v3($namespace, $name);

These are the default namespaces defined by the standard:
These are the default namespaces defined by the standard:

* ``Uuid::NAMESPACE_DNS`` if you are generating UUIDs for `DNS entries <https://en.wikipedia.org/wiki/Domain_Name_System>`__
* ``Uuid::NAMESPACE_URL`` if you are generating UUIDs for `URLs <https://en.wikipedia.org/wiki/URL>`__
* ``Uuid::NAMESPACE_OID`` if you are generating UUIDs for `OIDs (object identifiers) <https://en.wikipedia.org/wiki/Object_identifier>`__
* ``Uuid::NAMESPACE_X500`` if you are generating UUIDs for `X500 DNs (distinguished names) <https://en.wikipedia.org/wiki/X.500>`__
* ``Uuid::NAMESPACE_DNS`` if you are generating UUIDs for `DNS entries <https://en.wikipedia.org/wiki/Domain_Name_System>`__
* ``Uuid::NAMESPACE_URL`` if you are generating UUIDs for `URLs <https://en.wikipedia.org/wiki/URL>`__
* ``Uuid::NAMESPACE_OID`` if you are generating UUIDs for `OIDs (object identifiers) <https://en.wikipedia.org/wiki/Object_identifier>`__
* ``Uuid::NAMESPACE_X500`` if you are generating UUIDs for `X500 DNs (distinguished names) <https://en.wikipedia.org/wiki/X.500>`__

**UUID v4** (random)
Generates a random UUID (`read UUIDv4 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-4>`__).
Because of its randomness, it ensures uniqueness across distributed systems
without the need for a central coordinating entity. It's privacy-friendly
because it doesn't contain any information about where and when it was generated::

use Symfony\Component\Uid\Uuid;
Generates a random UUID (`read UUIDv4 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-4>`__).
Because of its randomness, it ensures uniqueness across distributed systems
without the need for a central coordinating entity. It's privacy-friendly
because it doesn't contain any information about where and when it was generated::

use Symfony\Component\Uid\Uuid;

// $uuid is an instance of Symfony\Component\Uid\UuidV4
$uuid = Uuid::v4();
// $uuid is an instance of Symfony\Component\Uid\UuidV4
$uuid = Uuid::v4();

**UUID v5** (name-based, SHA-1)
It's the same as UUIDv3 (explained above) but it uses ``sha1`` instead of
``md5`` to hash the given namespace and name (`read UUIDv5 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-5>`__).
This makes it more secure and less prone to hash collisions.

It's the same as UUIDv3 (explained above) but it uses ``sha1`` instead of
``md5`` to hash the given namespace and name (`read UUIDv5 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-5>`__).
This makes it more secure and less prone to hash collisions.

**UUID v6** (reordered time-based)
It rearranges the time-based fields of the UUIDv1 to make it lexicographically
sortable (like :ref:`ULIDs <ulid>`). It's more efficient for database indexing
(`read UUIDv6 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-6>`__)::

use Symfony\Component\Uid\Uuid;
It rearranges the time-based fields of the UUIDv1 to make it lexicographically
sortable (like :ref:`ULIDs <ulid>`). It's more efficient for database indexing
(`read UUIDv6 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-6>`__)::

use Symfony\Component\Uid\Uuid;

// $uuid is an instance of Symfony\Component\Uid\UuidV6
$uuid = Uuid::v6();
// $uuid is an instance of Symfony\Component\Uid\UuidV6
$uuid = Uuid::v6();

.. tip::
.. tip::

It's recommended to use UUIDv7 instead of UUIDv6 because it provides
better entropy.
It's recommended to use UUIDv7 instead of UUIDv6 because it provides
better entropy.

**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)
(`read 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)::

use Symfony\Component\Uid\Uuid;
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)
(`read 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)::

// $uuid is an instance of Symfony\Component\Uid\UuidV7
$uuid = Uuid::v7();
use Symfony\Component\Uid\Uuid;

// $uuid is an instance of Symfony\Component\Uid\UuidV7
$uuid = Uuid::v7();

**UUID v8** (custom)
Provides an RFC-compatible format for experimental or vendor-specific use cases
(`read UUIDv8 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-8>`__).
The only requirement is to set the variant and version bits of the UUID. The rest
of the UUID value is specific to each implementation and no format should be assumed::

use Symfony\Component\Uid\Uuid;
Provides an RFC-compatible format for experimental or vendor-specific use cases
(`read UUIDv8 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-8>`__).
The only requirement is to set the variant and version bits of the UUID. The rest
of the UUID value is specific to each implementation and no format should be assumed::

use Symfony\Component\Uid\Uuid;

// $uuid is an instance of Symfony\Component\Uid\UuidV8
$uuid = Uuid::v8();
// $uuid is an instance of Symfony\Component\Uid\UuidV8
$uuid = Uuid::v8();

.. versionadded:: 6.2

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