How to generate excel file in cakephp

cakephp_output_excel_file

//excel layout
<?php
header ("Expires: Mon, 28 Oct 2008 05:00:00 GMT");
header ("Last-Modified: " . gmdate("D,d M YH:i:s") . " GMT");
header ("Cache-Control: no-cache, must-revalidate");
header ("Pragma: no-cache");
header ("Content-type: application/vnd.ms-excel");
header ("Content-Disposition: attachment; filename=\"report_".date('dmy_His').".xls" );
header ("Content-Description: Generated Report" );
?>
<?php echo $content_for_layout ?> 

//$content_for_layout example :  basic table
<table>
    <tr>
    	<th width="10%">Guest Name</th>
      <th width="10%">Partner Name</th>
      <th width="10%">Company Name</th>
    </tr>
    <?php
        foreach ($bookings as $booking):
  	?>
        <tr>
        	<td>
        		<?php
        		  echo $booking['Guest']['name'] . ' ' . $booking['Guest']['surname'];
        		?>
        	</td>
          <td>
              <?php
                echo $booking['Partner']['name'] . ' ' . $booking['Partner']['surname'];
              ?>
          </td>
        </tr>
    <?php endforeach; ?>
</table>

//controller: the layout 'excel' is the one defined above
$this->render($render,'excel');