# symfony/polyfill-intl-icu

Symfony polyfill for intl's ICU-related data and classes

Repository: https://github.com/symfony/polyfill-intl-icu
Canonical: https://ross.abutalabs.com/products/polyfill-intl-icu
Homepage: https://symfony.com/polyfill-intl-icu
Language: PHP
License: MIT
License Family: permissive
Topics: symfony, polyfill, component, symfony-component, compatibility, icu, intl, javascript, portable, shim, symfony-polyfill
Last push: 2026-05-25T15:14:48+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 84, release rhythm 85, longevity 100
- inputs: {"age_days": 3968, "days_push": 100, "days_rel": 100, "gap_med": 6.5, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2589, forks 6 (observed 2026-08-28T04:07:02.853172+00:00)

## What it is
A Symfony polyfill package that provides fallback PHP implementations of the intl extension's ICU-related classes and functions when the ext-intl extension is not installed. It covers Collator, NumberFormatter, Locale, IntlDateFormatter, IntlListFormatter, and intl error helpers, limited to the 'en' locale.

## Use cases
- run PHP code that uses intl classes without installing ext-intl
- make a PHP library portable across hosts missing the intl extension
- get NumberFormatter and IntlDateFormatter fallbacks in English locale
- avoid fatal errors from missing Collator or Locale classes
- add intl compatibility shim via Composer

## When to choose
- your PHP package depends on intl classes but must work on hosts without ext-intl
- you need a lightweight Composer-installable compatibility layer
- your app only needs English-locale formatting and collation fallbacks

## When to avoid
- you need full ICU support for non-English locales
- the intl extension is already installed and guaranteed on your target environment
- you need complete IntlListFormatter or locale-aware behavior parity

## Facets
- artifact type: library
- maturity: stable
- function: internationalization, sdk, developer-tools
- domain: web-development, developer-tools, cross-platform
- platform: php
- tags: polyfill, icu, intl, shim, compatibility, symfony-component, fallback-implementation, localization, composer

## Member repositories
- symfony/polyfill-intl-icu (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:02.853172+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:22:22.728618+00:00, confidence not recorded.
  - readme: https://github.com/symfony/polyfill-intl-icu (fetched 2026-08-28T04:07:02.853172+00:00, sha 928514b1536b)
  - homepage: https://symfony.com/polyfill-intl-icu (fetched 2026-08-29T10:04:40.423692+00:00, sha 9df0268c04cd)
  - site_page: https://symfony.com/doc (fetched 2026-08-29T10:04:40.465053+00:00, sha 44889134f4fb)
  - site_page: https://symfony.com/releases (fetched 2026-08-29T10:04:40.486205+00:00, sha 2fd410222cfe)
  - site_page: https://symfony.com/blog/category/releases (fetched 2026-08-29T10:04:40.488848+00:00, sha b626b5bb1423)
- Data as of 2026-08-30T08:39:29.467469+00:00.