How to disable caching for logged in link or widget

Hello @praveen_khm

Thank you for your inquiry and I am happy to assist you with this.
You can use Page Fragment Cache for this. Please check our FAQ for more details.

You have to define the variable in your wp-config.php file. For security reasons, W3 Total Cache compares the string used in cached pages to the defined variable.
We recommend you choose a memory-based caching backend such as Redis or Memcached as this will not work with Disk: Enhanced, but if not available you should use the Disk Caching method.
Enable “late initialization” on the Page Cache settings page.
in your wp-config.php:
define('W3TC_DYNAMIC_SECURITY', 'mysecurestring');
You are then able to use the mfunc and mclude comments as a replacement of the PHP-tags like this:

<!-- mfunc mysecurestring -->
echo do_shortcode('[your_shortcode]');
<!-- /mfunc mysecurestring -->

Wrapping the shortcode with the mfunc comment will ensure that the dynamic part of the page, in this case, the shortcode is not cached.
I hope this helps!
Thanks!

Thanks for the response. It still does not work. These are the things I have done:

Added the below code in wp-config.php

define('W3TC_DYNAMIC_SECURITY', 'mysecurestring');

In Header.php, I have added this.

<!--mfunc <?php echo W3TC_DYNAMIC_SECURITY; ?> -->
	mytheme_extra_hotline();
	mytheme_extra_cart();
	mytheme_extra_account();
        echo(rand(10,100));
<!--/mfunc <?php echo W3TC_DYNAMIC_SECURITY; ?> -->

Since I am using a shared hosting, changed Disk Enhanced to Disk Caching method and enabled “late initialization” on the Page Cache settings page.

Added “mfunc” and “mclude” to Ignored comment stems under minify.

Whatever I did, it still did not refresh the code within mfunc. Lastly, I changed Expires header lifetime to 10 seconds and now it updates. However, the complete page is refreshing every 10 seconds.

Is there some setting I am missing?

Thanks,
Praveen

Hello @praveen_khm

Thank you for the information.
The conde is incorrect. you should wrap the widget with the mfunc and that will keep it uncached.
However, the main reason is the Expires header lifetime, so if everything is working as expected with the Expires header disabled or set to 10s you should leave it that way.
Please note that this is a browser Cache. The users are still getting the cached version of the page but in order for the login functionality to work it needs to be refreshed in the browser cache for the users.
Thanks!