Google Analytics tracking code HTML

google-analytics.php

<?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>
		(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', '<?php esc_attr_e( $google_analytics_code ); ?>', 'auto');
		ga('send', 'pageview');
		</script>

	<?php
	}
}
add_action( 'wp_head', 'dbt_add_google_analytics_tracking_code_to_document_head', 999 );