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Universally Unique Identifiers (UUID)

This PHP library, part of Lootils, creates and verifies RFC 4122 compliant version 3, 4, and 5 UUIDs.

For more information on UUIDs see

• The Wikipedia Artice on UUIDs
• RFC 4122

UUID Versions

This library works with 3 versions of UUIDs.

• Version 3: UUIDs generated based on a namespace and a name. Internally a MD5 hash is used. Note: version 5 is preferred over version 3.
• Version 4: Random UUIDs.
• Version 5: UUIDs generated based on a namespace and a name. Internally a sha1 hash is used.

Usage

I strongly suggest reading the code comments in uuid.php as it is well documented. Reading the tests may be helpful as well as there are examples in there.

Validating a UUID format

$valid = \Lootils\Uuid\Uuid::isValid($foo); // $valid will be a bool if it is valid or not.

The UUID Object

The UUID object is one that can be created though its constructor but most often should happen via one of the version factirues in UUID::createV3, UUID::createV4, UUID::createV5.

Once an object is created there are a number of methods you can use. They include:

• listFields: This lists the available fields.
• getField: This returns the value for a passed in field name.
• getVersion: Returns the UUID version (3, 4, or 5) if it is known.
• getNamespace: Returns the namespace used to generate the UUID if it is known.
• getName: Returns the name used to generate the UUID if it is known.
• getURN: Returns a URN for the UUID.

If you print the uuid you will get it as a string. For example:

$uuid = \Lootils\Uuid\Uuid::createV4();
print $uuid; // This will display the UUID in the format 6ba7b810-9dad-11d1-80b4-00c04fd430c8.

If you are not using one of the factories you can create the an object using the following arguments:

$uuid = new \Lootils\Uuid\Uuid($uuid, $version, $namespace, $name);

The arguments are in the form:

• $uuid: The UUID as can be supplied in 4 different formats.

  • As a hex string in the format '{6ba7b810-9dad-11d1-80b4-00c04fd430c8}'.
  • Via a URN with the format 'urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8'.
  • Though an array in the form array('35e872b4', '190a', '5faa', 'a0', 'f6', '09da0d4f9c01').
  • With an array where the keys are the field names as seen on the listField method.
• $version: The version if known. Could be Uuid::V3, Uuid::V4, Uuid::V5.
• $namespace: For v3 and v5, the namespace used if it is known..
• $name: For v3 and v5, the name used if it is known.

Creating a Random UUID

$uuid = \Lootils\Uuid\Uuid::createV4(); // $uuid is now a random UUID.

Creating a v5 UUID

$uuid = \Lootils\Uuid\Uuid::createV5(\Lootils\Uuid\Uuid::URL, 'http://example.com/foo.html');

Verifying a v5 UUID

If you know the namespace and name for a v5 UUID you can recreate and verify it. UUIDs created with the same namespace and name will always be the same. For example:

$uuid1 = \Lootils\Uuid\Uuid::createV5(\Lootils\Uuid\Uuid::URL, 'http://example.com/foo.html');
$uuid2 = \Lootils\Uuid\Uuid::createV5(\Lootils\Uuid\Uuid::URL, 'http://example.com/foo.html');

In this case $uuid1 is equal to $uuid2.

Creating a v3 UUID

$uuid = \Lootils\Uuid\Uuid::createV3(\Lootils\Uuid\Uuid::URL, 'http://example.com/foo.html');

Verifying a v3 UUID

If you know the namespace and name for a v3 UUID you can recreate and verify it. UUIDs created with the same namespace and name will always be the same. For example:

$uuid1 = \Lootils\Uuid\Uuid::createV3(\Lootils\Uuid\Uuid::URL, 'http://example.com/foo.html');
$uuid2 = \Lootils\Uuid\Uuid::createV3(\Lootils\Uuid\Uuid::URL, 'http://example.com/foo.html');

In this case the uuid hex string value for $uuid1 is equal to $uuid2.

Creating a Custom Namespace

If you want to create a custom namespace (like the URL and DNS ones) for your application you can do so with v3 or v5 methods and a NIL namespace. For example:

$namespace = \Lootils\Uuid\Uuid::createV5(\Lootils\Uuid\Uuid::NIL, 'my_app_name');

License

This library was written by Matt Farina and is available under the MIT License.