NumberFormatter::setTextAttribute
Locale::composeLocale
intl
PHP Manual

# The Locale class

## Introduction

A "Locale" is an identifier used to get language, culture, or regionally-specific behavior from an API. PHP locales are organized and identified the same way that the CLDR locales used by ICU (and many vendors of Unix-like operating systems, the Mac, Java, and so forth) use. Locales are identified using RFC 4646 language tags (which use hyphen, not underscore) in addition to the more traditional underscore-using identifiers. Unless otherwise noted the functions in this class are tolerant of both formats.

Examples of identifiers include:

- en-US (English, United States)
- zh-Hant-TW (Chinese, Traditional Script, Taiwan)
- fr-CA, fr-FR (French for Canada and France respectively)

The Locale class (and related procedural functions) are used to interact with locale identifiers--to verify that an ID is well-formed, valid, etc. The extensions used by CLDR in UAX #35 (and inherited by ICU) are valid and used wherever they would be in ICU normally.

Locales cannot be instantiated as objects. All of the functions/methods provided are static.

The null or empty string obtains the "root" locale. The "root" locale is equivalent to "en_US_POSIX" in CLDR. Language tags (and thus locale identifiers) are case insensitive. There exists a canonicalization function to make case match the specification.

## Class synopsis

Locale
class Locale {
/* Methods */
static string composeLocale ( array `$subtags` )
static boolean filterMatches ( string `$langtag` , string `$locale` )
static array getAllVariants ( string `$locale` )
static string getDefault ( void )
static string getDisplayLanguage ( string `$locale` [, string `$in_locale` ] )
static string getDisplayName ( string `$locale` [, string `$in_locale` ] )
static string getDisplayRegion ( string `$locale` [, string `$in_locale` ] )
static string getDisplayScript ( string `$locale` [, string `$in_locale` ] )
static string getDisplayVariant ( string `$locale` [, string `$in_locale` ] )
static array getKeywords ( string `$locale` )
static string getPrimaryLanguage ( string `$locale` )
static string getRegion ( string `$locale` )
static string getScript ( string `$locale` )
static string lookup ( array `$langtag` , string `$locale` , string `$default` )
static array parseLocale ( string `$locale` )
static boolean setDefault ( string `$locale` )
}

## Predefined Constants

These constants define how the Locale

`Locale::DEFAULT_LOCALE` (string)
  Used with the getLocale methods of the various locale affected classes, such as numfmt.
`Locale::ACTUAL_LOCALE` (string)
  This is locale the data actually comes from.
`Locale::VALID_LOCALE` (string)
  This is the most specific locale supported by ICU.

These constants define how the Locales are parsed or composed. They should be used as keys in the argument array to locale_compose() and are returned from locale_parse() as keys of the returned associative array.

`Locale::LANG_TAG` (string)
  Language subtag
`Locale::EXTLANG_TAG` (string)
  Extended language subtag
`Locale::SCRIPT_TAG` (string)
  Script subtag
`Locale::REGION_TAG` (string)
  Region subtag
`Locale::VARIANT_TAG` (string)
  Variant subtag
`Locale::GRANDFATHERED_LANG_TAG` (string)
  Grandfathered Language subtag
`Locale::PRIVATE_TAG` (string)
  Private subtag

## See Also

- » RFC 4646 - Tags for Identifying Languages
- » RFC 4647 - Matching of Language Tags
- » Unicode CLDR Project:Common Locale Data Repository
- » IANA Language Subtags Registry
- » ICU User Guide - Locale
- » ICU Locale api

## Table of Contents

- Locale::composeLocale — Returns a correctly ordered and delimited locale ID
- Locale::filterMatches — Checks if a $langtag filter matches with $locale according to
- Locale::getAllVariants — Gets the variants for the input locale
- Locale::getDefault — Gets the default locale value from the INTL global 'default_locale'
- Locale::getDisplayLanguage — Returns an appropriately localized display name for language of the inputlocale
- Locale::getDisplayName — Returns an appropriately localized display name for the input locale
- Locale::getDisplayRegion — Returns an appropriately localized display name for region of the input locale
- Locale::getDisplayScript — Returns an appropriately localized display name for script of the input locale
- Locale::getDisplayVariant — Returns an appropriately localized display name for variants of the input locale
- Locale::getKeywords — Gets the keywords for the input locale
- Locale::getPrimaryLanguage — Gets the primary language for the input locale
- Locale::getRegion — Gets the region for the input locale
- Locale::getScript — Gets the script for the input locale
- Locale::lookup — Searches the language tag list for the best match to the language
- Locale::parseLocale — Returns a key-value array of locale ID subtag elements.
- Locale::setDefault — sets the default runtime locale

NumberFormatter::setTextAttribute
Locale::composeLocale
intl
PHP Manual