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[Utility & Helpers](/categories/utility) 4. / 5. hhvm/hsl-experimental AbandonedArchivedLibrary[Utility & Helpers](/categories/utility) hhvm/hsl-experimental ===================== The Hack Standard Library - Experimental Additions v4.108.0(5y ago)23629.4k↑461.9%10[12 issues](https://github.com/hhvm/hsl-experimental/issues)20MITHack Since Sep 28Pushed 3y ago10 watchersCompare [ Source](https://github.com/hhvm/hsl-experimental)[ Packagist](https://packagist.org/packages/hhvm/hsl-experimental)[ RSS](/packages/hhvm-hsl-experimental/feed)WikiDiscussions main Synced 3w ago READMEChangelog (10)Dependencies (5)Versions (57)Used By (20) [![Continuous Integration](https://github.com/hhvm/hsl-experimental/workflows/Continuous%20Integration/badge.svg)](https://github.com/hhvm/hsl-experimental/workflows/Continuous%20Integration/badge.svg) Hack Standard Library - Experimental Additions ============================================== [](#hack-standard-library---experimental-additions) This repository contains functionality that may be added to [the Hack Standard Library](https://github.com/hhvm/hsl/) in the future. It is only tested on nightly builds of HHVM, and there is no intent to provide API stability. Installation ------------ [](#installation) ``` composer require hhvm/hsl-experimental ``` Documentation ------------- [](#documentation) - [input and output](https://docs.hhvm.com/hack/getting-started/input-and-output) - [API reference](https://docs.hhvm.com/hsl-experimental/reference/) Contributing ------------ [](#contributing) See [CONTRIBUTING.md](CONTRIBUTING.md). License ------- [](#license) The Hack Standard Library Experimental Additions are MIT-licensed. ### Health Score 45 — FairBetter than 91% of packages Maintenance10 Infrequent updates — may be unmaintained Popularity47 Moderate usage in the ecosystem Community38 Small or concentrated contributor base Maturity76 Established project with proven stability Bus Factor1 Top contributor holds 60.6% 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 Every ~17 days Recently: every ~35 days Total 56 Last Release 1876d ago Major Versions v3.30.2 → v4.0.02019-02-08 v3.30.3 → v4.0.22019-03-04 v3.30.4 → v4.1.x-dev2019-04-09 ### Community Maintainers ![](https://www.gravatar.com/avatar/66d33e29918fd8cc713997dbbe03cb86e2aefbdc6736637641cdffed2f22accb?d=identicon)[fredemmott](/maintainers/fredemmott) ![](https://avatars.githubusercontent.com/u/8306375?v=4)[HHVM Community Bot](/maintainers/hhvm-bot)[@hhvm-bot](https://github.com/hhvm-bot) --- Top Contributors [![fredemmott](https://avatars.githubusercontent.com/u/360927?v=4)](https://github.com/fredemmott "fredemmott (146 commits)")[![kmeht](https://avatars.githubusercontent.com/u/1120478?v=4)](https://github.com/kmeht "kmeht (26 commits)")[![jjergus](https://avatars.githubusercontent.com/u/2483917?v=4)](https://github.com/jjergus "jjergus (16 commits)")[![DavidSnider](https://avatars.githubusercontent.com/u/10112104?v=4)](https://github.com/DavidSnider "DavidSnider (13 commits)")[![azjezz](https://avatars.githubusercontent.com/u/29315886?v=4)](https://github.com/azjezz "azjezz (9 commits)")[![lexidor](https://avatars.githubusercontent.com/u/31805625?v=4)](https://github.com/lexidor "lexidor (4 commits)")[![rodmk](https://avatars.githubusercontent.com/u/2280164?v=4)](https://github.com/rodmk "rodmk (4 commits)")[![alexeyt](https://avatars.githubusercontent.com/u/727402?v=4)](https://github.com/alexeyt "alexeyt (3 commits)")[![hgoldstein](https://avatars.githubusercontent.com/u/5455867?v=4)](https://github.com/hgoldstein "hgoldstein (3 commits)")[![vassilmladenov](https://avatars.githubusercontent.com/u/5396637?v=4)](https://github.com/vassilmladenov "vassilmladenov (3 commits)")[![WizKid](https://avatars.githubusercontent.com/u/59419?v=4)](https://github.com/WizKid "WizKid (3 commits)")[![periodic1236](https://avatars.githubusercontent.com/u/1748071?v=4)](https://github.com/periodic1236 "periodic1236 (2 commits)")[![zpao](https://avatars.githubusercontent.com/u/8445?v=4)](https://github.com/zpao "zpao (2 commits)")[![dneiter](https://avatars.githubusercontent.com/u/1376793?v=4)](https://github.com/dneiter "dneiter (2 commits)")[![Atry](https://avatars.githubusercontent.com/u/601530?v=4)](https://github.com/Atry "Atry (2 commits)")[![Antondomashnev](https://avatars.githubusercontent.com/u/2076088?v=4)](https://github.com/Antondomashnev "Antondomashnev (1 commits)")[![dado3212](https://avatars.githubusercontent.com/u/8919256?v=4)](https://github.com/dado3212 "dado3212 (1 commits)")[![facebook-github-bot](https://avatars.githubusercontent.com/u/6422482?v=4)](https://github.com/facebook-github-bot "facebook-github-bot (1 commits)") ### Embed Badge ![Health badge](/badges/hhvm-hsl-experimental/health.svg) ``` [![Health](https://phpackages.com/badges/hhvm-hsl-experimental/health.svg)](https://phpackages.com/packages/hhvm-hsl-experimental) ``` PHPackages © 2026 [Directory](/)[Categories](/categories)[Trending](/trending)[Changelog](/changelog)[Analyze](/analyze)