Руководство по PHP
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mb_strwidth

(PHP 4 >= 4.0.6)

mb_strwidth -- Return width of string

Description

int mb_strwidth ( string str [, string encoding])

mb_strwidth() returns width of string str.

Multi-byte character usually twice of width compare to single byte character. 

Character width

       U+0000 - U+0019   0
       U+0020 - U+1FFF   1
       U+2000 - U+FF60   2
       U+FF61 - U+FF9F   1
       U+FFA0 -          2

encoding is character encoding. If it is omitted, internal encoding is used.

See also: mb_strimwidth(), mb_internal_encoding().

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mb_strtoupperУровень вышеmb_substitute_character