IIRC the conversion rules are locale specific. use setlocale() 
to set appropriate environment.

At 13:01 12.1. 2001, TV Karthick Kumar wrote the following:
-------------------------------------------------------------- 
>Hi all,
>
>    I have a problem while converting the string into upper case by using
>the strtoupper function.
>
>    I want to convert the string which has some special characters in it.
>For example, med vänlig hälsning, António etc. There are lots of strings /
>words with some special characters in it. It cannot be listed.
>
>    As I want to convert them into upper case, I tried.
>strtoupper(hälsning), it's just converting it as: HäLSNING and then writes
>onto the database. But I want that special character - ' ä ' also to be
>converted into upper case and then onto the database. How do I get rid of
>this problem and convert into upper case ?.
>
>    PLS. HELP ME.
>
>    Thanks in advance.
>
>~ Karthick
>
>
>
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