[SMARTY] How to change HTTP headers

Hi.

I want to change HTTP headers to insert PHP command:
header("Content-type: text/html; charset=utf-8");

I created this PHP function:
-----------
function smartyHeader()
{
	header("Content-type: text/html; charset=utf-8");	
}//getZone
------------

Registered it (on my 'config.php'):
--------
$template->register_function("phpHeader", "smartyHeader");
----------

And used it (at the very first line of my 'index.tpl'):
-------
{phpHeader}
------

But when analyzing my HTTP headers, I get:
--------
* Content-Type = text/html; charset=ISO-8859-1
--------

What am I doing wrong? Thank you very much.

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