easyappointments/application/views/components/google_analytics_script.php

<?php
/**
 * @var string $google_analytics_code
 */
?>

<?php if (substr($google_analytics_code, 0, 2) === 'UA'): ?>
    <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", "<?= $google_analytics_code ?>", "auto");
        ga("send", "pageview");
    </script>
<?php endif ?>

<?php if (substr($google_analytics_code, 0, 2) === 'G-'): ?>
    <script async src="https://www.googletagmanager.com/gtag/js?id=' . $google_analytics_code . '"></script>
    <script>
        window.dataLayer = window.dataLayer || [];
        function gtag(){dataLayer.push(arguments);}
        gtag("js", new Date());
        gtag("config", "<?= $google_analytics_code ?>");
    </script>
<?php endif ?>