Wordpress: add Google Analytics. (NB: please change UA-69841290-2 with your own Google Analytics Code)

functions.php

/*
 * Add Google Analytics 
 */

function mb_add_analytics() {

    ?> 

    <!-- Global site tag (gtag.js) - Google Analytics -->
    <script async src="https://www.googletagmanager.com/gtag/js?id=UA-69841290-2"></script>
    <script>
      window.dataLayer = window.dataLayer || [];
      function gtag(){dataLayer.push(arguments);}
      gtag('js', new Date());

      gtag('config', 'UA-69841290-2');
    </script>

    <?php

}

add_action('wp_head', 'mb_add_analytics', 99);