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[Utility & Helpers](/categories/utility) 4. / 5. softinvest/int-to-uuid ActiveLibrary[Utility & Helpers](/categories/utility) softinvest/int-to-uuid ====================== Utility for Bidirectional Conversion of Integer Ids to UUIDs v1.0.0(10mo ago)0656MITPHPPHP ^8.3 Since Jul 11Pushed 10mo agoCompare [ Source](https://github.com/appsinvest/int-to-uuid)[ Packagist](https://packagist.org/packages/softinvest/int-to-uuid)[ RSS](/packages/softinvest-int-to-uuid/feed)WikiDiscussions main Synced 1mo ago READMEChangelog (1)Dependencies (7)Versions (2)Used By (0) Integer ID To RFC 4122 UUID Converter ===================================== [](#integer-id-to-rfc-4122-uuid-converter) Bidirectionally encodes a non-negative 64-bit unsigned "id" integer and optional 32-bit "namespace" integer into a valid [RFC 4122](https://www.rfc-editor.org/rfc/rfc4122) UUID, with the internet-draft [Version 8](https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis-00#section-5.8)format. The id and namespace integers are encoded to obscure their value and produce non-sequential UUIDs, while guaranteeing uniqueness and reproducibility. This could be used to present an auto-incrementing integer "database id" as a UUID (proxy ID) in a public context, where you would not want to expose an enumerable, sequential value directly tied to your database structure/data. Since the encoded UUID can be converted back into integer namespace and id values at runtime, the UUID does not need to be persisted in the database or otherwise indexed to the ID it represents. **Note:** The integer ID and namespace values are only *encoded* in the UUID, not *encrypted*, and the value can be recovered by a third party with effort. This library is intended to support on-demand conversion between an integer and a UUID, while mitigating basic "user enumeration attacks". Securely encrypting a 64-bit integer in the 122 bits available in a UUID is currently outside the scope of this library. Usage ----- [](#usage) #### Encode ID with Default Namespace (0) to UUID [](#encode-id-with-default-namespace-0-to-uuid) ``` $id = \SoftInvest\IntToUuid\IntegerId::make(12); $uuid = \SoftInvest\IntToUuid\IntToUuid::encode($id); echo $uuid->toString(); // 14228ed0-822c-8d5d-b9c3-30d2a75c0e10 ``` #### Encode ID with Namespace to UUID [](#encode-id-with-namespace-to-uuid) ``` $id = \SoftInvest\IntToUuid\IntegerId::make(42, 12); $uuid = \SoftInvest\IntToUuid\IntToUuid::encode($id); echo $uuid->toString(); // 97ed98ee-0994-8f79-b993-bcb7a2905968 ``` #### Decode UUID to ID and Namespace Integers [](#decode-uuid-to-id-and-namespace-integers) ``` $uuid = \Ramsey\Uuid\Uuid::fromString('97ed98ee-0994-8f79-b993-bcb7a2905968'); $id = \SoftInvest\IntToUuid\IntToUuid::decode($uuid); echo $id->value; // 42 echo $id->namespace; // 12 ``` ### Conversion Algorithm [](#conversion-algorithm) Encoding an integer uses a deterministic seed based on the xxHash (`xxh3`) hash of the concatenated binary strings packed from the id and namespace values. The first 32-bits of the hash are used as the contiguous `time_hi_and_version`, `clock_seq_hi_and_reserved`, and `clock_seq_low` fields. To comply with the RFC 4122 Version 8, the seed is multiplexed with the required Version and Variant bits, leaving 26 bits of deterministic "pseudo-randomness". The encoded id is the id integer packed as a 64-bit binary string XOR the xxHash hash of the namespace and seed. The encoded namespace is the namespace integer packed as a 32-bit binary string XOR the xxHash hash of the seed. The resulting octets are arranged into a valid UUID and a new `UuidInterface` (from the `ramsey/uuid`library) is returned. Decoding is the reverse of the encoding process: the UUID octets are split into the encoded id, encoded namespace, and seed binary strings, XOR is applied to the encoded values and corresponding hashes, and a "checksum" seed is produced from the decoded binary strings, which are then unpacked into integer values. If the seed value from the UUID does not match the checksum seed, then UUID does not encode valid information, and an exception is thrown. An exception is also thrown if the UUID passed into the decode function is not a valid Version 8 UUID. #### RFC 4122 UUID Field Names and Bit Layout [](#rfc-4122-uuid-field-names-and-bit-layout) ``` 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | time_low | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | time_mid | time_hi_and_version | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |clk_seq_hi_res | clk_seq_low | node (0-1) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | node (2-5) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ``` #### Encoded Integer ID Field and Bit Layout [](#encoded-integer-id-field-and-bit-layout) ``` 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | namespace | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | id (0-1) | seed (0-1) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | seed (2-3) | id (2-3) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | id (4-7) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ``` ### Why RFC 4122 Version 8? [](#why-rfc-4122-version-8) The other UUID versions defined by RFC 4122 have distinct generation algorithms and properties. Versions 1, 2, 6, and 7 are based on the current timestamp. Version 3 (Name-Based MD5) and Version 5 (Name-Based SHA1) are deterministic for a string "name" and "namespace" values, but are unidirectional because they are based on hash functions. Version 4 (Random) comes the closest to fulfilling our needs: 122 of the 128 bits are randomly/pseudo-randomly generated. The same algorithm used here *could* be used to generate encoded UUIDs that *look* like Version 4 UUIDs, but they would not be technically compatible with the RFC definition, or have the expected universal uniqueness property. The proposed Version 8 defines a new, RFC-compatible format for experimental or vendor-defined UUIDs. The definition allows for both implementation-specific uniqueness and for the embedding of arbitrary information, both of which are key to this particular use case. While Version 8 is currently in the IETF review process, it is expected to be accepted without significant changes. ### Health Score 34 — LowBetter than 77% of packages Maintenance54 Moderate activity, may be stable Popularity13 Limited adoption so far Community9 Small or concentrated contributor base Maturity51 Maturing project, gaining track record Bus Factor1 Top contributor holds 62.5% of commits — single point of failure How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window. **Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores. **Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. Measures real ecosystem engagement. **Maturity (30%)** — Project age, version count, PHP version support, and release stability. ### Release Activity Cadence Unknown Total 1 Last Release 306d ago ### Community Maintainers ![](https://www.gravatar.com/avatar/3435693ce772ee50f22731e0f2031eaa6804789e6583ee0467f5b669d2919770?d=identicon)[softinvest](/maintainers/softinvest) --- Top Contributors [![andysnell](https://avatars.githubusercontent.com/u/7006523?v=4)](https://github.com/andysnell "andysnell (10 commits)")[![appsinvest](https://avatars.githubusercontent.com/u/151177991?v=4)](https://github.com/appsinvest "appsinvest (3 commits)")[![bugfix666](https://avatars.githubusercontent.com/u/151177991?v=4)](https://github.com/bugfix666 "bugfix666 (3 commits)") ### Code Quality TestsPHPUnit Static AnalysisPHPStan, Rector Type Coverage Yes ### Embed Badge ![Health badge](/badges/softinvest-int-to-uuid/health.svg) ``` [![Health](https://phpackages.com/badges/softinvest-int-to-uuid/health.svg)](https://phpackages.com/packages/softinvest-int-to-uuid) ``` ### Alternatives [grumpydictator/firefly-iii Firefly III: a personal finances manager. 22.8k69.3k](/packages/grumpydictator-firefly-iii)[pocketmine/pocketmine-mp A server software for Minecraft: Bedrock Edition written in PHP 3.5k74.6k86](/packages/pocketmine-pocketmine-mp)[shlinkio/shlink A self-hosted and PHP-based URL shortener application with CLI and REST interfaces 4.8k4.3k](/packages/shlinkio-shlink)[getdkan/dkan DKAN Open Data Catalog 385135.4k2](/packages/getdkan-dkan)[firefly-iii/data-importer Firefly III Data Import Tool. 7545.8k](/packages/firefly-iii-data-importer)[tomaj/hermes Simple php background processing library 38251.0k5](/packages/tomaj-hermes) PHPackages © 2026 [Directory](/)[Categories](/categories)[Trending](/trending)[Changelog](/changelog)[Analyze](/analyze)