Modified Wordpress datalayer variables for pulling: author names, post types, categories, page name, and dates into custom variables for the classic version of Google Analytics. Feel free to leave a comment or hit me up http://BryanBarrera.com

Wordpress Data Layer Variables

// Add this script after you make your dataLayer = []; call
// AND after your GTM code snippet
// This needs to go inside the header.php in order for it work globally across your site
<script type="text/javascript">
	// URL toolbox - helps grabbing elements in the URL
	var _d = document;
	var _dl = _d.location;
	var _dlp = _dl.pathname;
	var _dls = _dl.search;
	var _dr = _d.referrer;

	// Initialize your data layer and start pushing variables from custom WordPress PHP data layer
	dataLayer.push({

		<?php if (is_404()){
		// For: 404 page/ 404 errors
		// 404 pages, handled with a /404/ prefix as well as the referrer ?>
		"GTM_WP_404": "<?php print is_404(); ?>",
		"GTM_WP_404_URL": "/404" + _dlp + "/"+ _dr,
		<?php } ?>


		<?php if (is_single()) {
		// For: single posts
		// Query the WP API to retrieve post type, author, category, and post name

		$gtm_cat = get_the_category();

		// Now we populate the Javascript data layer with our PHP variables
		?>
		"GTM_WP_pagename": "<?php print wp_title(); ?>",
		"GTM_WP_authorname": "<?php print get_the_author(); ?>",
		"GTM_WP_post_type": "<?php print get_post_type(); ?>",
		"GTM_WP_Category": "<?php print $gtm_cat[0]->cat_name; ?>",
		<?php } ?>


		<?php if(is_page()|| is_category()) {
		// We only want the page name and author name for pages and categories
		// For: pages and categories
		// Query the WP API to retrieve page name and author name
		?>

		"GTM_WP_pagename": "<?php print wp_title(); ?>",
		"GTM_WP_authorname": "<?php print get_the_author(); ?>",
		<?php }
		// Date is appended to each if statement above
		// Done with WordPress page type/conditions, you can add more default dataLayer variables below ?>
		"GTM_WP_date": "<?php print get_the_date(); ?>",

		<?php if (is_search()) {
			// if it's a search
		?>
		"GTM_WP_search_query": "<?php print get_search_query(); ?>"
		<?php } ?>

	});

</script>