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Internationalization extension (further is referred as Intl) is a wrapper for » ICU library, enabling PHP programmers to perform » UCA-conformant collation and date/time/number/currency formatting in their scripts.
It tends to closely follow ICU APIs, so that people having experience working with ICU in either C/C++ or Java could easily use the PHP API. Also, this way ICU documentation would be useful to understand various ICU functions.
Intl consists of several modules, each of them exposes the corresponding ICU API:
- Collator: provides string comparison capability with support for appropriate locale-sensitive sort orderings.
- Number Formatter: allows to display number according to the localized format or given pattern or set of rules, and to parse strings into numbers.
- Message Formatter: allows to create messages incorporating data (such as numbers or dates) formatted according to given pattern and locale rules, and parse messages extracting data from them.
- Normalizer: provides a function to transform text into one of the Unicode normalization forms, and provides a routine to test if a given string is already normalized.
- Locale: provides interaction with locale identifiers in the form of functions to get subtags from locale identifier; parse, compose, match(lookup and filter) locale identifiers.
Описание на ru2.php.net
Описание на php.ru