使用 phpexcel 如何寫進A1~Z1 的資料

$objPHPExcel->setActiveSheetIndex(0);
$title=array('Designer','Client','Product Class','Product Stage','Model NAME','Product Description');

$objPHPExcel->getActiveSheet()->setTitle('Simple');
$i=65;
foreach($title as $key => $value){
//echo $value."<br />";

$objPHPExcel->getActiveSheet()->setCellValue(chr($i)."1", $value);

$i++;

}