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<?php

define('GOOGLE_ANALYTICS_ID', ''); // UA-XXXXX-Y (Note: Universal Analytics only, not Classic Analytics)

function roots_google_analytics() { ?>
<script>
  (function(b,o,i,l,e,r){b.GoogleAnalyticsObject=l;b[l]||(b[l]=
  function(){(b[l].q=b[l].q||[]).push(arguments)});b[l].l=+new Date;
  e=o.createElement(i);r=o.getElementsByTagName(i)[0];
  e.src='//www.google-analytics.com/analytics.js';
  r.parentNode.insertBefore(e,r)}(window,document,'script','ga'));
  ga('create','<?php echo GOOGLE_ANALYTICS_ID; ?>');ga('send','pageview');
</script>

<?php }
if (GOOGLE_ANALYTICS_ID && !current_user_can('manage_options')) {
  add_action('wp_footer', 'roots_google_analytics', 20);
}