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.
    
      
Table 1. Characters width
| 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 | 
     encoding is character encoding. If it is
     omitted, internal encoding is used.
    
     See also: mb_strimwidth(),
     mb_internal_encoding().