<?php 

$objPHPExcel = new PHPExcel();
$objPHPExcel->setActiveSheetIndex(0);
$rowCount = 1;
while($row = mysql_fetch_array($result)){
    $objPHPExcel->getActiveSheet()->SetCellValue('A'.$rowCount, $row['name']);
    $objPHPExcel->getActiveSheet()->SetCellValue('B'.$rowCount, $row['age']);
    $rowCount++;
}
$objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel);
$objWriter->save('some_excel_file.xlsx');

?>

Basic usage for PHPExcel with an mysql_fetch_array

PHPExcel basic array loop

PHP