(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 7) Check if code point is a hexadecimal digit

(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) Check if this zone has the same rules and offset as another zone

(PHP >= 5.4.0, PECL intl >= 2.0.0) Set the checks to run

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get timezone ID

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get the raw GMT offset (before taking daylight savings time into account

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Returns an appropriately localized display name for language

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get current collation strength