Tracking code to insert google analytics

How does the code would have to be inserted into the functions.php file of my theme son customizr to add the tracking code that gives me google analytics ?.
thanks in advance

<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-54064230-1’, ‘auto’);
ga(‘send’, ‘pageview’);

</script>