Description
string 
mb_strtolower ( string str [, string encoding] )
     mb_strtolower() returns str
     with all alphabetic characters converted to lowercase.
    
     encoding specifies the encoding of
     str; if omitted, the internal character encoding
     value will be used.
    
     For more information about the Unicode properties, please see http://www.unicode.org/unicode/reports/tr21/.
    
     By contrast to strtolower(), '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 (Ä). 
    
     
| Example 1. mb_strtolower() example | 
<?php$str = "Mary Had A Little Lamb and She LOVED It So";
 $str = mb_strtolower($str);
 echo $str; // Prints mary had a little lamb and she loved it so
 ?>
 | 
 | 
    
     See also strtolower(),
     mb_strtoupper() and
     mb_convert_case().