(PHP 4 >= 4.0.5, PHP 5, PHP 7) Convert string to requested character encoding

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Clear the current session

(PHP 5 >= 5.3.0, PHP 7, PECL enchant >= 0.1.0 ) add a word to personal word list

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

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

(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 enchant >= 0.1.0 ) Whether a dictionary exists or not. Using non-empty tag

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Canonicalize the locale string

(PHP 5, PHP 7) Finds the last occurrence of a needle within a haystack

(PHP 5 >= 5.3.0, PHP 7, PECL enchant >= 1.0.1) Returns a list of available dictionaries