(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get string length

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get internal character encoding

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Parse GET/POST/COOKIE data and set global variable

(PHP 5, PHP 7) Returns an array of all supported encodings

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Setup string and regular expression for a multibyte regular expression match