Exporter les données en excel via php

require_once './Classes/PHPExcel.php';

$query = "SELECT Name, CountryCode FROM City ORDER by ID DESC";

if ($result = $mysqli->query($query)) {
    // Create a new PHPExcel object
    $objPHPExcel = new PHPExcel();
    $objPHPExcel->getActiveSheet()->setTitle('List of Cities');

    // Loop through the result set
    $rowNumber = 1;
    while ($row = $result->fetch_row()) {
        $objPHPExcel->getActiveSheet()->fromArray($row,NULL,'A'.$rowNumber++);
    }
    // Save as an Excel BIFF (xls) file
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
    $objWriter->save('CityList.xls');
}