Fecha Setlocale es_ES caracteres con acento

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Cambié mi función a:

<?php
class Destination {
var $filename;

function Destination($filename) {
$this->set_filename($filename);
}

function filename_escape($filename) {
$vocalti = array ("á","é","í","ó","ú","Á","É","Í","Ó","Ú");
$vocales = array ("a","e","i","o","u","A","E","I","O","U");
return str_replace($vocalti, $vocales,$filename);}

function get_filename() { return empty($this->filename) ? OUTPUT_DEFAULT_NAME : $this->filename; }

function process($filename, $content_type) {
die("Oops. Inoverridden 'process' method called in ".get_class($this));
}

function set_filename($filename) { $this->filename = $filename; }
}
?>

Ahora obtengo "É" en lugar del "_", originalmente MI_ -> MIÉ, quiero que salga MIE