Using Functions.php to insert Google Analytics into a site's head

Wordpress UA code (Analytics)

<?php
add_action( 'wp_head', 'mxms_google_analytics' );
function mxms_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','//www.google-analytics.com/analytics.js','ga');
		  ga('create', 'UA-0000000-0', 'auto');
		  ga('send', 'pageview');
	</script><?php
}