add-google-analytics-in-wp-site.php

/*--------------------------------------------------------------
# Google Analytics script (gets called into head element)
--------------------------------------------------------------*/

function fq_google_analytics() {

  $google_ua_code = 'xxxxxxxxxxxxx'; // Add "UA" code for this site from Google

	echo "<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','https://www.google-analytics.com/analytics.js','ga');

	  ga('create', '" . $google_ua_code . "', 'auto');
	  ga('send', 'pageview');

	</script>";
}
add_action( 'wp_head', 'fq_google_analytics', 10 );