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

(PHP 7) Get the "mirror-image" character for a code point

(PHP >= 5.4.0, PECL intl >= 2.0.0) Create a transliterator

(PHP 7) Return Unicode character by code point value

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get the error code from last operation

(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)