Aggiunta del codice di Google Analytics in un sito WordPress

functions.php

//* Google Analytics
add_action( 'wp_head', 'custom_google_analytics', 99);
function custom_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-12345-6', 'auto');
  	ga('send', 'pageview');
	</script>
<?php }