Cacher is the code snippet organizer for pro developers

<?php 
/**
 * Google Analytics tracking code.
 */
function dbt_add_google_analytics_tracking_code_to_document_head() {
        $google_analytics_code = get_option( 'dbt_google_analytics_code' );
        if ( $google_analytics_code && ! is_user_logged_in() && ! is_customize_preview() ) { ?>

		<!-- Google Analytics -->
		<script>window.ga=function(){ga.q.push(arguments)};ga.q=[];ga.l=+new Date;ga('create','UA-53907410-1','auto');ga('send','pageview');</script>
		<script src="//www.google-analytics.com/analytics.js" async></script>
	<?php
	}
}
add_action( 'wp_head', 'dbt_add_google_analytics_tracking_code_to_document_head', 999 );