Multibyte String
PHP Manual

mb_strlen

(PHP 4 >= 4.0.6, PHP 5)

mb_strlen — Get string length

Description

int mb_strlen ( string $str [, string $encoding ] )

mb_strlen() returns number of characters in string str having character encoding encoding . A multi-byte character is counted as 1.

encoding is character encoding for str . If encoding is omitted, internal character encoding is used.

See also mb_internal_encoding(), strlen().


Multibyte String
PHP Manual