mb_convert_encoding not working???

[Anon]

Hi, I am using this sample of code

$string = mb_http_output("utf-8");

echo mb_convert_encoding($string, "utf-8");

but it does not work, does not display anithing in the browser. However,

echo utf8_encode($string);

works nicely, writing in such a way that it can be processed perfectly for third applications which needs the text displayed in the browser to be in utf-8 format...

Any comment will be apreciated.

Cesar