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- .. _introduction:
- ============
- Introduction
- ============
- ramsey/uuid is a PHP library for generating and working with `RFC 4122`_ version
- 1, 2, 3, 4, 5, 6, and 7 universally unique identifiers (UUID). ramsey/uuid also
- supports optional and non-standard features, such as GUIDs and other approaches
- for encoding/decoding UUIDs.
- What Is a UUID?
- ###############
- A universally unique identifier, or UUID, is a 128-bit unsigned integer, usually
- represented as a hexadecimal string split into five groups with dashes. The most
- widely-known and used types of UUIDs are defined by `RFC 4122`_.
- A UUID, when encoded in hexadecimal string format, looks like:
- .. code-block:: text
- ebb5c735-0308-4e3c-9aea-8a270aebfe15
- The probability of duplicating a UUID is close to zero, so they are a great
- choice for generating unique identifiers in distributed systems.
- UUIDs can also be stored in binary format, as a string of 16 bytes.
- .. _RFC 4122: https://tools.ietf.org/html/rfc4122
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