// functions.php
<?php
function sp_google_analytics() { ?>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-xxxxxxxxxx"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){
dataLayer.push(arguments);
}
gtag('js', new Date());
gtag('config', 'UA-xxxxxxxxxx');
</script>
<?php
}
add_action( 'wp_head', 'sp_google_analytics' );
?>Will correctly add Google Analytics code into the website <head> tag.