/*
include 'PHPExcel/IOFactory.php';
$inputFileType = 'Excel5';
$inputFileName = 'MyExcelFile.xls';

$objReader = PHPExcel_IOFactory::createReader($inputFileType);
$objPHPExcel = $objReader->load($inputFileName);

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'HTML');
$objWriter->save('php://output');
exit;

EDIT

If your Excel file is Excel 2007 (xlsx) or later rather than Excel 2003 (xls) or earlier
include 'PHPExcel/IOFactory.php';
$inputFileType = 'Excel2007';
$inputFileName = 'MyExcelFile.xlsx';

$objReader = PHPExcel_IOFactory::createReader($inputFileType);
$objPHPExcel = $objReader->load($inputFileName);

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'HTML');
$objWriter->save('php://output');
exit; */

/*

// <?php
// header('Content-Disposition: attachment; filename='. $monFichier);
// ?>

//<?php
// $file = 'monkey.gif';

// if (file_exists($file)) {
//    header('Content-Description: File Transfer');
//    header('Content-Type: application/octet-stream');
//    header('Content-Disposition: attachment; filename="'.basename($file).'"');
//    header('Expires: 0');
//    header('Cache-Control: must-revalidate');
//    header('Pragma: public');
//    header('Content-Length: ' . filesize($file));
//    readfile($file);
//    exit;
//}
//?> 

 */