control based action in anchor tag not showing in server

In my windows system working, but in server this will not be working

Code:

 <?php
$actionbutton = $row['status'] == 'success' ? anchor('Users/getpdf/'.$row['appno'],'Generate Pdf','class="btn btn-success"') : anchor('Users/validate/'.($row['appno']),'Pending','class="btn btn-warning"')  ;
?>
<td align="center" ><?= $actionbutton;?></td>

need help.