Downloading data in excel format with PHP And Unicode

public function _exportToCSV($status){
    $columnHeader = "";

    $setData = '';

    $findAll =  ImportUsers::model()->findAll("status = $status");
    if(!empty($findAll)){
        foreach($findAll as $objData){
            $rowData = '';
            $value = '"' . $objData->title1 . '"' . "\t";
            $value .= '"' . $objData->title2 . '"' . "\t";
            $value .= '"' . $objData->title3 . '"' . "\t";

            $rowData .= $value;
            $setData .= trim($rowData) . "\n";
        }
    }
    $fileName = 'output.csv';
    header("Content-type: application/octet-stream");
    header("Content-Disposition: attachment; filename = $fileName");
    header('Content-Transfer-Encoding: binary');
    header("Pragma: no-cache");
    header("Expires: 0");

    echo  chr(255).chr(254).iconv("UTF-8", "UTF-16LE//IGNORE",  $setData . "\n");

    exit();
}

Enjoy.