I have followed steps from there but I'm not able to get fragment cache to work (which was main reason to get PRO version)
Example code inside a template looks like:
<!--mfunc <?php echo W3TC_DYNAMIC_SECURITY; ?> -->
echo 'The time is '.date( 'H:i:s', time() );
<!--/mfunc <?php echo W3TC_DYNAMIC_SECURITY; ?> -->
so in that case I expect to see The time is and right time but it works only once and then it shows echo 'The time is '.date( 'H:i:s', time() ); as a plain text.
First you need to define W3TC_DYNAMIC_SECURITY
constant in your wp-config.php file
define('W3TC_DYNAMIC_SECURITY', 'FRAGMENT_CACHING');
then you can test it with the code below (any template):
<?php echo date("H:i:s"); ?>
<br>
<!-- mfunc FRAGMENT_CACHING -->
echo date("H:i:s");
<!-- /mfunc FRAGMENT_CACHING -->
<br>
<div id="mydiv"><p>The current time is
<!-- mfunc FRAGMENT_CACHING echo date("H:i:s"); -->
echo date("H:i:s");
<!-- /mfunc FRAGMENT_CACHING -->
</div>