Add Google Analytics to WordPress

tracking.php

<?php
/**
 * Add Tracking Scripts
 */

function helpwp_google_analytics() { ?>

	<script>
	  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
	  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
	  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
	  })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

	  ga('create', 'UA-XXXXXXXX-X', 'auto');
	  ga('send', 'pageview');

	</script>

<?php }
add_action('wp_head', 'helpwp_google_analytics');