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// originally based on https://gist.github.com/kenhowardpdx/8484076
// updated to current gtag.js snippet and moved to head
function rtp_init_analytics() {
    $analytics_id = 'YOUR UA CODE HERE';

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

// filter out administrators
if (!is_admin()) {
    if(!current_user_can( 'manage_options' ) ) {
        add_action('wp_head', 'rtp_init_analytics', 35);
    }
}