(PHP 4 >= 4.0.6, PHP 5)
mb_strwidth — Return width of string
$str
   [, string $encoding = mb_internal_encoding()
  ] )
   Returns the width of string str.
  
Multi-byte characters are usually twice the width of single byte characters.
| Chars | Width | 
|---|---|
| U+0000 - U+0019 | 0 | 
| U+0020 - U+1FFF | 1 | 
| U+2000 - U+FF60 | 2 | 
| U+FF61 - U+FF9F | 1 | 
| U+FFA0 - | 2 | 
strThe string being decoded.
encodingThe encoding
parameter is the character encoding. If it is omitted, the internal character
encoding value will be used.
   The width of string str.