(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Function to extract a sequence of default grapheme clusters

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Check whether the given error code indicates failure

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get string length in grapheme units

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

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.2, PHP 7, PECL idn >= 0.1) Convert domain name from IDNA ASCII