rmpel/ga4.php

## ga4.php
<?php // wp-content/mu-plugins/ga4.php - GA4 tracker boilerplate.
define('GA_NOT_LIVE', true); // remove for go

define('GA4_MEASUREMENT_ID', 'G-XXXXXXXXXX'); // required
define('UA_PROPERTY_ID', 'UA-XXXXXXX-YY'); // optional
define('GA_ANONYMIZE_IP', true); // optional
define('GA_TRACK_ADMINS', false); // optional, defaults to true
define('GA_TRACK_EDITORS', false); // optional, defaults to true

// we need GA as first thing in the body
add_action('wp_body_open', 'GA4', ~PHP_INT_MAX);
// but not all sites have that, so fall back to first in footer.
add_action('wp_footer', 'GA4', ~PHP_INT_MAX);

function GA4() {
  // remember that we did this, we only need it once;
  static $done;
  if ($done) {
    return;
  }
  $done = true;

  if (current_action() === 'wp_footer') {
    print '
<!-- DEVELOPER NOTE: please add

<'.'?php do_action(\'wp_body_open\'); ?'.'>

directly after the <body> open tag in your theme. -->
'; }

  $track = true;
  // fallback for UA-only tracker, should not be, but well, you know, sometimes ...
  $ga4_tracker = 'G-XXXXXXXXXX' === GA4_MEASUREMENT_ID ? UA_PROPERTY_ID : GA4_MEASUREMENT_ID;
  $ua_tracker = defined('UA_PROPERTY_ID') && preg_match('/UA-[0-9]+-[0-9]+/', UA_PROPERTY_ID) && UA_PROPERTY_ID !== $ga4_tracker ? UA_PROPERTY_ID  : false;

  if (current_user_can('manage_options') && defined('GA_TRACK_ADMINS') && !GA_TRACK_ADMINS) $track = false;
  if (current_user_can('edit_posts') && defined('GA_TRACK_EDITORS') && !GA_TRACK_EDITORS) $track = false;

  if ( ! $track ) {
    ?><!-- Google Analytics is disabled for your user level -->
<script>window['ga-disable-<?php print $ga4_tracker; ?>'] = true;<?php if ($ua_tracker) { ?>window['ga-disable-<?php print $ua_tracker; ?>'] = true; <?php } ?></script><?php
  }

  ?><!-- Global site tag (gtag.js) - Google Analytics 4 -->
<script async <?php print defined('GA_NOT_LIVE') ? 'disabled-' : '' ?>src="https://www.googletagmanager.com/gtag/js?id=<?php print $ga4_tracker; ?>"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){ dataLayer.push(arguments); }
  gtag('js', new Date());
  gtag('config', '<?php print $ga4_tracker; ?>', { 'anonymize_ip': <?php print json_encode(defined('GA_ANONYMIZE_IP') ? !!GA_ANONYMIZE_IP : false); ?> });
  <?php if ($ua_tracker) { ?>gtag('config', '<?php print $ua_tracker; ?>', { 'anonymize_ip': <?php print json_encode(!!GA_ANONYMIZE_IP); ?> });<?php } ?>
</script>
<!-- End Google Analytics --><?php

}
	<?php // wp-content/mu-plugins/ga4.php - GA4 tracker boilerplate.
	define('GA_NOT_LIVE', true); // remove for go

	define('GA4_MEASUREMENT_ID', 'G-XXXXXXXXXX'); // required
	define('UA_PROPERTY_ID', 'UA-XXXXXXX-YY'); // optional
	define('GA_ANONYMIZE_IP', true); // optional
	define('GA_TRACK_ADMINS', false); // optional, defaults to true
	define('GA_TRACK_EDITORS', false); // optional, defaults to true

	// we need GA as first thing in the body
	add_action('wp_body_open', 'GA4', ~PHP_INT_MAX);
	// but not all sites have that, so fall back to first in footer.
	add_action('wp_footer', 'GA4', ~PHP_INT_MAX);

	function GA4() {
	// remember that we did this, we only need it once;
	static $done;
	if ($done) {
	return;
	}
	$done = true;

	if (current_action() === 'wp_footer') {
	print '
	<!-- DEVELOPER NOTE: please add

	<'.'?php do_action(\'wp_body_open\'); ?'.'>

	directly after the <body> open tag in your theme. -->
	'; }

	$track = true;
	// fallback for UA-only tracker, should not be, but well, you know, sometimes ...
	$ga4_tracker = 'G-XXXXXXXXXX' === GA4_MEASUREMENT_ID ? UA_PROPERTY_ID : GA4_MEASUREMENT_ID;
	$ua_tracker = defined('UA_PROPERTY_ID') && preg_match('/UA-[0-9]+-[0-9]+/', UA_PROPERTY_ID) && UA_PROPERTY_ID !== $ga4_tracker ? UA_PROPERTY_ID : false;

	if (current_user_can('manage_options') && defined('GA_TRACK_ADMINS') && !GA_TRACK_ADMINS) $track = false;
	if (current_user_can('edit_posts') && defined('GA_TRACK_EDITORS') && !GA_TRACK_EDITORS) $track = false;

	if ( ! $track ) {
	?><!-- Google Analytics is disabled for your user level -->
	<script>window['ga-disable-<?php print $ga4_tracker; ?>'] = true;<?php if ($ua_tracker) { ?>window['ga-disable-<?php print $ua_tracker; ?>'] = true; <?php } ?></script><?php
	}

	?><!-- Global site tag (gtag.js) - Google Analytics 4 -->
	<script async <?php print defined('GA_NOT_LIVE') ? 'disabled-' : '' ?>src="https://www.googletagmanager.com/gtag/js?id=<?php print $ga4_tracker; ?>"></script>
	<script>
	window.dataLayer = window.dataLayer \|\| [];
	function gtag(){ dataLayer.push(arguments); }
	gtag('js', new Date());
	gtag('config', '<?php print $ga4_tracker; ?>', { 'anonymize_ip': <?php print json_encode(defined('GA_ANONYMIZE_IP') ? !!GA_ANONYMIZE_IP : false); ?> });
	<?php if ($ua_tracker) { ?>gtag('config', '<?php print $ua_tracker; ?>', { 'anonymize_ip': <?php print json_encode(!!GA_ANONYMIZE_IP); ?> });<?php } ?>
	</script>
	<!-- End Google Analytics --><?php

	}