(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Set the destination encoding

(PHP 5 >= 5.3.0, PHP 7, PECL enchant >= 0.1.0 ) Check whether a word is correctly spelled or not

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Convert string from one charset to another

(PHP >= 5.4.0, PECL intl >= 2.0.0) Transliterate a string

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Find position (in grapheme units) of first occurrence of a

(PHP >= 5.4.0, PECL intl >= 2.0.0) Get last error message

(PHP >= 5.4.0, PECL intl >= 2.0.0) Private constructor to deny instantiation

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Make a string uppercase

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Add value to field without carrying into more significant fields

(PHP 7) Check if code point is a printable character