Puoi prendere spunto da quello che segue.

Il foglio excel "prova.xls" contiene due colonne con dei numeri.

codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<body>
<? 
// lancio Excel rendendolo invisibile 
$excel = new COM("Excel.Application"); 
$excel->Visible = 0; 
//
$excel->SheetsInNewWorkbook=1; 
$excel->Workbooks->Open('c:\temp\PROVA.XLS');; 
$book=$excel->Workbooks(1); 
$sheet=$book->Worksheets(1); 
$sheet->Activate;
?>
<table summary=""><? 
$continua = true;
$i        = 0;
while ($continua) {
 $i++;
 $colonnaA = $sheet->Cells($i,1);
 if ($colonnaA->Value != '') {
	$colonnaB = $sheet->Cells($i,2);?>
  <tr>
   <td><? print $colonnaA->Value ?></td>
	 <td><? print $colonnaB->Value ?></td>
  </tr><? 
 } else {
  $continua = false;
 }
}  ?>
</table>

<?
$excel->Application->Quit;
// scollego Excel 
unset($excel); 
 ?>
</body>
</html>