Twansparant on "[Plugin: W3 Total Cache] Exclude footer with Google Analytics cookie check?"

Hi there,

I have the following setup;
- I Added a cookie accept bar with CookieCuttr to the head of my pages
- In my functions.php I do a check if the cookie is set and is accepted and if so add the Google Analytics script to the footer of all the pages like this:

// Include the Google Analytics Tracking Code (ga.js)
function google_analytics_tracking_code(){
	$propertyID = 'UA-XXXXXX-XX'; // GA Property ID
	if ($propertyID) { ?>
<!-- Google Analytics -->
<script type="text/javascript">
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', '<?php echo $propertyID; ?>']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>
  <?php }
}
// Add script to footer
if (isset($_COOKIE['cc_cookie_accept']) && $_COOKIE['cc_cookie_accept'] == 'cc_cookie_accept') {
  add_action('wp_footer', 'google_analytics_tracking_code', 100);
} ?>

- Excluded my functions.php and footer.php files from the Page Cache like this:

functions\.php
footer\.php

But this doesn't work. If cookies aren't accepted yet, the Google Analytics code isn't in the footer, so that works. But when I accept the cookies, the page refreshes automatically but the GA code is still not in the footer. However, when I login in WP and empty the cache, the GA code is present.

So my question is; how can I prevent this?
What should I exclude exactly? Or is there an easier way to do this?

Thanks!

https://wordpress.org/plugins/w3-total-cache/