Export XLS/CSV from EE template

gistfile1.php

<?php
	header("Content-type: application/vnd.ms-excel");
	header("Content-Disposition: attachment; filename=enrolments.xls");
	header("Pragma: no-cache");
	header("Expires: 0");
?>
<table>
	<thead>
		<tr>
			<th>First name</th>
			<th>Last name</th>
		</tr>
	</thead>
	<tbody>
		{exp:channel:entries channel="enrolments" disable="categories|member_data|pagination|trackbacks" dynamic="no"}
		<tr>
			<td>{first_name}</td>
			<td>{last_name}</td>
		</tr>
		{/exp:channel:entries}
	</tbody>
</table>