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
Intl consists of several modules, each of them exposes the corresponding
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
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
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.