Add Google Analytics 4 to WordPress footer

wp_ga_footer.php

<?php
/**
 * Google Analytics 4 Integration
 *
 * This code adds Google Analytics 4 to the website's footer automatically.
 * It executes only when the viewer is NOT an admin to avoid tracking admin activity.
 * To activate place in functions.php and replace 'G-XXXXXXXXXX' with your actual Google Analytics Measurement ID. 
 *
 * Gist Keywords: wordpress, google, analytics
 *
 * @category   Wordpress
 * @author     Knol Aust
 * @version    1.0.0
 * @description This code snippet adds Google Analytics 4 to your WordPress website. It includes the necessary JavaScript code to enable tracking.
 */

/**
 * Add Google Analytics to the website footer.
 */
function add_google_analytics() {
	// Replace 'G-XXXXXXXXXX' with your actual Google Analytics Measurement ID
	$measurement_id = 'G-XXXXXXXXXX';
	?>
	<script async src="https://www.googletagmanager.com/gtag/js?id=<?php echo esc_attr($measurement_id); ?>"></script>
	<script>
		window.dataLayer = window.dataLayer || [];
		function gtag(){dataLayer.push(arguments);}
		gtag('js', new Date());
		gtag('config', '<?php echo esc_attr($measurement_id); ?>'); // Replace with the variable
	</script>
	<?php
}

// Only add Google Analytics if the viewer is not an admin
if ( ! is_admin() ) {
	add_action('wp_footer', 'add_google_analytics');
}