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

(PHP 7) Return Unicode character by code point value

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Returns a correctly ordered and delimited locale ID

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

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

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get description of the last error

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

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Clear a field or all fields

(PHP 7) Check if code point is a lowercase letter

(PHP 7) Check if code point has the general category "Lu" (uppercase letter)