Stuff

<?php
$client_dir = @ dir(ABSPATH . '/clients/test');
if ($client_dir) {
	while(($file = $client_dir->read()) !== false) {
	  if ( !preg_match('|^\.+$|', $file) && ( !preg_match('|\.php$|', $file) ) 
		$client_files[] = $file;
	}
}
if ($client_dir || $client_files) :
?>
  <ul>
<?php foreach($client_files as $client_file) : ?>
	<li>
	<a href="schedules/<?php echo $client_file; ?>"><?php echo $client_file; ?></a>
	</li>
<?php endforeach; ?>
  </ul>
<?php endif; ?>