Determine if attachment is PDF or Mp3

[Darussalam]

Hi, I need help with conditional statements to determine if the attachment is a PDF file, Mp3 or any other as I want to display different text on the button depending on the download item. PDF will say, View Sample PDF, Mp3 will say Listen Sample Audio and 'Download Sample' for all others. Will really appreciate any help. Below is my code for downloading product attachments.

 

      <!--Download -->
  {if isset($attachments) && $attachments} 
    {foreach from=$attachments item=attachment name=attachements}
    {if $smarty.foreach.attachements.iteration %3 == 1}
    <div class="row">
      {/if}
        <a class="btn btn-default btn-block" style="font-size: 16px;" href="{$link->getPageLink('attachment', true, NULL, "id_attachment={$attachment.id_attachment}")|escape:'html':'UTF-8'}" target="_blank"> <i class="icon-download"></i> {l s="Download Sample"} ({Tools::formatBytes($attachment.file_size, 2)}) </a>
      {if $smarty.foreach.attachements.iteration %3 == 0 || $smarty.foreach.attachements.last}
    </div>
    {/if}
    {/foreach} 
 {/if}
  <!--end Download --> 

Thank you!

[Darussalam]

Still waiting if someone can help.

I want to a statement to check if the $attachment.name contains 'pdf' to display "View Sample PDF'.

Searching online but haven't find a solution yet.

Edited July 23, 2018 by Darussalam (see edit history)