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Read the upgrade guide for details on how these changes may impact your code and what you can do to ease the upgrade process.


  • Add support for version 6 UUIDs, as defined by,
    including the static method Uuid::uuid6(), which returns a
    Nonstandard\UuidV6 instance.
  • Add ability to generate version 2 (DCE Security) UUIDs, including the static
    method Uuid::uuid2(), which returns an Rfc4122\UuidV2 instance.
  • Add classes to represent each version of RFC 4122 UUID. When generating new
    UUIDs or creating UUIDs from existing strings, bytes, or integers, if the UUID
    is an RFC 4122 variant, one of these instances will be returned:
    • Rfc4122\UuidV1
    • Rfc4122\UuidV2
    • Rfc4122\UuidV3
    • Rfc4122\UuidV4
    • Rfc4122\UuidV5
    • Rfc4122\NilUuid
  • Add classes to represent version 6 UUIDs, GUIDs, and nonstandard
    (non-RFC 4122 variant) UUIDs:
    • Nonstandard\UuidV6
    • Guid\Guid
    • Nonstandard\Uuid
  • Add Uuid::fromDateTime() to create version 1 UUIDs from instances of
  • The \DateTimeInterface instance returned by UuidInterface::getDateTime()
    (and now Rfc4122\UuidV1::getDateTime()) now includes microseconds, as
    specified by the version 1 UUID.
  • Add Validator\ValidatorInterface and Validator\GenericValidator to allow
    flexibility in validating UUIDs/GUIDs.
    • The default validator continues to validate UUID strings using the same
      relaxed validation pattern found in the 3.x series of ramsey/uuid.
    • Introduce Rfc4122\Validator that may be used for strict validation of
      RFC 4122 UUID strings.
    • Add ability to change the default validator used by Uuid through
    • Add getValidator() and setValidator() to UuidFactory.
  • Add Provider\Node\StaticNodeProvider to assist in setting a custom static
    node value with the multicast bit set for version 1 UUIDs.
  • Add the following new exceptions:
    • Exception\BuilderNotFoundException -
      Thrown to indicate that no suitable UUID builder could be found.
    • Exception\DateTimeException -
      Thrown to indicate that the PHP DateTime extension encountered an
    • Exception\DceSecurityException -
      Thrown to indicate an exception occurred while dealing with DCE Security
      (version 2) UUIDs.
    • Exception\InvalidArgumentException -
      Thrown to indicate that the argument received is not valid. This extends the
      built-in PHP \InvalidArgumentException, so there should be no BC breaks
      with ramsey/uuid throwing this exception, if you are catching the PHP
    • Exception\InvalidBytesException -
      Thrown to indicate that the bytes being operated on are invalid in some way.
    • Exception\NameException -
      Thrown to indicate that an error occurred while attempting to hash a
      namespace and name.
    • Exception\NodeException -
      Throw to indicate that attempting to fetch or create a node ID encountered
      an error.
    • Exception\RandomSourceException -
      Thrown to indicate that the source of random data encountered an error.
    • Exception\TimeSourceException -
      Thrown to indicate that the source of time encountered an error.
    • Exception\UnableToBuildUuidException -
      Thrown to indicate a builder is unable to build a UUID.
  • Introduce a Builder\FallbackBuilder, used by FeatureSet to help decide
    whether to return a Uuid or Nonstandard\Uuid when decoding a
    UUID string or bytes.
  • Add Rfc4122\UuidInterface to specifically represent RFC 4122 variant UUIDs.
  • Add Rfc4122\UuidBuilder to build RFC 4122 variant UUIDs. This replaces the
    existing Builder\DefaultUuidBuilder, which is now deprecated.
  • Introduce Math\CalculatorInterface for representing calculators to perform
    arithmetic operations on integers.
  • Depend on brick/math for the
    Math\BrickMathCalculator, which is the default calculator used by this
    library when math cannot be performed in native PHP due to integer size
    limitations. The calculator is configurable and may be changed, if desired.
  • Add Converter\Number\GenericNumberConverter and
    Converter\Time\GenericTimeConverter which will use the calculator provided
    to convert numbers and time to values for UUIDs.
  • Introduce Type\Hexadecimal, Type\Integer, Type\Decimal, and Type\Time
    for improved type-safety when dealing with arbitrary string values.
  • Add a Type\TypeInterface that each of the ramsey/uuid types implements.
  • Add Fields\FieldsInterface and Rfc4122\FieldsInterface to define
    field layouts for UUID variants. The implementations Rfc4122\Fields,
    Guid\Fields, and Nonstandard\Fields store the 16-byte,
    binary string representation of the UUID internally, and these manage
    conversion of the binary string into the hexadecimal field values.
  • Introduce Builder\BuilderCollection and Provider\Node\NodeProviderCollection.
    These are typed collections for providing builders and node providers to
    Builder\FallbackBuilder and Provider\Node\FallbackNodeProvider, respectively.
  • Add Generator\NameGeneratorInterface to support alternate methods of
    generating bytes for version 3 and version 5 name-based UUID. By default,
    ramsey/uuid uses the Generator\DefaultNameGenerator, which uses the standard
    algorithm this library has used since the beginning. You may choose to use the
    new Generator\PeclUuidNameGenerator to make use of the new
    uuid_generate_md5() and uuid_generate_sha1() functions in
    ext-uuid version 1.1.0.


  • Set minimum required PHP version to 7.2.
  • This library now works on 32-bit and 64-bit systems, with no degradation in
  • By default, the following static methods will now return specific instance
    types. This should not cause any BC breaks if typehints target UuidInterface:
    • Uuid::uuid1 returns Rfc4122\UuidV1
    • Uuid::uuid3 returns Rfc4122\UuidV3
    • Uuid::uuid4 returns Rfc4122\UuidV4
    • Uuid::uuid5 returns Rfc4122\UuidV5
  • Accept Type\Hexadecimal for the $node parameter for
    UuidFactoryInterface::uuid1(). This is in addition to the int|string types
    already accepted, so there are no BC breaks. Type\Hexadecimal is now the
    recommended type to pass for $node.
  • Out of the box, Uuid::fromString(), Uuid::fromBytes(), and
    Uuid::fromInteger() will now return either an Rfc4122\UuidInterface
    instance or an instance of Nonstandard\Uuid, depending on whether the input
    contains an RFC 4122 variant UUID with a valid version identifier. Both
    implement UuidInterface, so BC breaks should not occur if typehints use the
  • Change Uuid::getFields() to return an instance of Fields\FieldsInterface.
    Previously, it returned an array of integer values (on 64-bit systems only).
  • Uuid::getDateTime() now returns an instance of \DateTimeImmutable instead
    of \DateTime.
  • Make the following changes to UuidInterface:
    • getHex() now returns a Type\Hexadecimal instance.
    • getInteger() now returns a Type\Integer instance. The Type\Integer
      instance holds a string representation of a 128-bit integer. You may then
      use a math library of your choice (bcmath, gmp, etc.) to operate on the
      string integer.
    • getDateTime() now returns \DateTimeInterface instead of \DateTime.
    • Add __toString() method.
    • Add getFields() method. It returns an instance of Fields\FieldsInterface.
  • Add the following new methods to UuidFactoryInterface:
    • uuid2()
    • uuid6()
    • fromDateTime()
    • fromInteger()
    • getValidator()
  • This library no longer throws generic exceptions. However, this should not
    result in BC breaks, since the new exceptions extend from built-in PHP
    exceptions that this library previously threw.
    • Exception\UnsupportedOperationException is now descended from
      \LogicException. Previously, it descended from \RuntimeException.
  • Change required constructor parameters for Uuid:
    • Change the first required constructor parameter for Uuid from
      array $fields to Rfc4122\FieldsInterface $fields.
    • Add Converter\TimeConverterInterface $timeConverter as the fourth
      required constructor parameter for Uuid.
  • Change the second required parameter of Builder\UuidBuilderInterface::build()
    from array $fields to string $bytes. Rather than accepting an array of
    hexadecimal strings as UUID fields, the build() method now expects a byte
  • Add Converter\TimeConverterInterface $timeConverter as the second required
    constructor parameter for Rfc4122\UuidBuilder. This also affects the
    now-deprecated Builder\DefaultUuidBuilder, since this class now inherits
    from Rfc4122\UuidBuilder.
  • Add convertTime() method to Converter\TimeConverterInterface.
  • Add getTime() method to Provider\TimeProviderInterface. It replaces the
    currentTime() method.
  • Provider\Node\FallbackNodeProvider now accepts only a
    Provider\Node\NodeProviderCollection as its constructor parameter.
  • Provider\Time\FixedTimeProvider no longer accepts an array but accepts only
    Type\Time instances.
  • Provider\NodeProviderInterface::getNode() now returns Type\Hexadecimal
    instead of string|false|null.
  • Converter/TimeConverterInterface::calculateTime() now returns
    Type\Hexadecimal instead of array. The value is the full UUID timestamp
    value (count of 100-nanosecond intervals since the Gregorian calendar epoch)
    in hexadecimal format.
  • Change methods in NumberConverterInterface to accept and return string values
    instead of mixed; this simplifies the interface and makes it consistent.
  • Generator\DefaultTimeGenerator no longer adds the variant and version bits
    to the bytes it returns. These must be applied to the bytes afterwards.
  • When encoding to bytes or decoding from bytes, OrderedTimeCodec now checks
    whether the UUID is an RFC 4122 variant, version 1 UUID. If not, it will throw
    an exception—InvalidArgumentException when using
    OrderedTimeCodec::encodeBinary() and UnsupportedOperationException when
    using OrderedTimeCodec::decodeBytes().


The following functionality is deprecated and will be removed in ramsey/uuid

  • The following methods from UuidInterface and Uuid are deprecated. Use their
    counterparts on the Rfc4122\FieldsInterface returned by Uuid::getFields().
    • getClockSeqHiAndReservedHex()
    • getClockSeqLowHex()
    • getClockSequenceHex()
    • getFieldsHex()
    • getNodeHex()
    • getTimeHiAndVersionHex()
    • getTimeLowHex()
    • getTimeMidHex()
    • getTimestampHex()
    • getVariant()
    • getVersion()
  • The following methods from Uuid are deprecated. Use the Rfc4122\FieldsInterface
    instance returned by Uuid::getFields() to get the Type\Hexadecimal value
    for these fields. You may use the new Math\CalculatorInterface::toIntegerValue()
    method to convert the Type\Hexadecimal instances to instances of
    Type\Integer. This library provides Math\BrickMathCalculator, which may be
    used for this purpose, or you may use the arbitrary-precision arithemetic
    library of your choice.
    • getClockSeqHiAndReserved()
    • getClockSeqLow()
    • getClockSequence()
    • getNode()
    • getTimeHiAndVersion()
    • getTimeLow()
    • getTimeMid()
    • getTimestamp()
  • getDateTime() on UuidInterface and Uuid is deprecated. Use this method
    only on instances of Rfc4122\UuidV1 or Nonstandard\UuidV6.
  • getUrn() on UuidInterface and Uuid is deprecated. It is available on
    Rfc4122\UuidInterface and classes that implement it.
  • The following methods are deprecated and have no direct replacements. However,
    you may obtain the same information by calling UuidInterface::getHex() and
    splitting the return value in half.
    • UuidInterface::getLeastSignificantBitsHex()
    • UuidInterface::getMostSignificantBitsHex()
    • Uuid::getLeastSignificantBitsHex()
    • Uuid::getMostSignificantBitsHex()
    • Uuid::getLeastSignificantBits()
    • Uuid::getMostSignificantBits()
  • UuidInterface::getNumberConverter() and Uuid::getNumberConverter() are
    deprecated. There is no alternative recommendation, so plan accordingly.
  • Builder\DefaultUuidBuilder is deprecated; transition to Rfc4122\UuidBuilder.
  • Converter\Number\BigNumberConverter is deprecated; transition to
  • Converter\Time\BigNumberTimeConverter is deprecated; transition to
  • The classes for representing and generating degraded UUIDs are deprecated.
    These are no longer necessary; this library now behaves the same on 32-bit and
    64-bit systems.
    • Builder\DegradedUuidBuilder
    • Converter\Number\DegradedNumberConverter
    • Converter\Time\DegradedTimeConverter
    • DegradedUuid
  • The Uuid::UUID_TYPE_IDENTIFIER constant is deprecated. Use
    Uuid::UUID_TYPE_DCE_SECURITY instead.
  • The Uuid::VALID_PATTERN constant is deprecated. Use
    Validator\GenericValidator::getPattern() or Rfc4122\Validator::getPattern()


  • Remove the following bytes generators and recommend
    Generator\RandomBytesGenerator as a suitable replacement:
    • Generator\MtRandGenerator
    • Generator\OpenSslGenerator
    • Generator\SodiumRandomGenerator
  • Remove Exception\UnsatisfiedDependencyException. This library no longer
    throws this exception.
  • Remove the method Provider\TimeProviderInterface::currentTime(). Use
    Provider\TimeProviderInterface::getTime() instead.