Template for adding Google Analytics tracking code to site's head.

google-analytics-tracking-template.php

<?php

/* Copy the Content Below this line - DO NOT INCLUDE THE <?php ABOVE */

/**
* Add Google Analytics tracking code
*/
function cf_google_analytics_tracking() { ?>
<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-12345678-1', 'auto');
	ga('send', 'pageview');

</script>
<?php }
add_action( 'wp_head', 'cf_google_analytics_tracking', 10 );