(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Checks if a language tag filter matches with locale

(PHP 7) Get the combining class of a code point

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a2) Convert an IntlCalendar into a DateTime object

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Quick parse input string

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Suggest spellings of a word

(PHP 5, PHP 7) Decodes multiple MIME header fields at once

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Returns the matched part of a multibyte regular expression

(No version information available, might only be in Git) Set minimal number of days the first week in a year

(PHP >= 5.3.2, PECL intl >= 2.0.0) Get supported locales

(PHP >= 5.4.0, PECL intl >= 2.0.0) Checks if a given text contains any confusable characters