Description
string 
mb_strtoupper ( string str [, string encoding] )
     mb_strtoupper() returns str
     with all alphabetic characters converted to uppercase.
    
     encoding specifies the encoding of
     str; if omitted, the internal character encoding
     value will be used.
    
     By contrast to strtoupper(), 'alphabetic' is
     determined by the Unicode character properties. Thus the behaviour of this
     function is not affected by locale settings and it can convert any
     characters that have 'alphabetic' property, such as a-umlaut (รค). 
    
     For more information about the Unicode properties, please see http://www.unicode.org/unicode/reports/tr21/.
    
     
Example 1. mb_strtoupper() example 
<?php $str = "Mary Had A Little Lamb and She LOVED It So"; $str = mb_strtoupper($str); echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO ?>
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     See also strtoupper(),
     mb_strtolower() and
     mb_convert_case().