(PHP 7) Perform case folding on a code point

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

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Gets the primary language for the input locale

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Create GMT (UTC) timezone

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get last error message on the object

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get minimal number of days the first week in a year or month can have

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get formatter locale

(PHP 7) Check if code point is permissible as the first character in a Java identifier

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Checks if the provided string is already in the specified

(No version information available, might only be in Git) Create break iterator for boundaries of code points