(PHP 4 >= 4.2.0, PHP 5, PHP 7) Multibyte regular expression match for predefined multibyte string
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Detect HTTP input character encoding
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get part of string
(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
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