warren.lees

Haven’t received any response on this. For anyone reading this who may be interested in doing something similar I will include below the code changes I made to this plug-in in my own copy.

In the plug-in file at:
…./wp-content/plugins/metronet-tag-manager/metronet-tag-manager.php
At approximately line 85 you will see this segment:

public function filter_post_date( $total_match, $match, $post_id ) {
		$post_date = get_post_field( 'post_date', $post_id );
		return $post_date;
	} //end filter_post_date

After this add my 3 similar new functions

//Added functions by WL @ TEQ to get extra custom data output
	public function filter_post_categories( $total_match, $match, $post_id) {
		$cats = array();
		foreach (get_the_category($post_id) as $c) {
		$cat = get_category($c);
		array_push($cats, $cat->name);
		}
		if (sizeOf($cats) > 0) {
		$post_categories = implode('|', $cats);
		} else {
		$post_categories = 'Not Assigned';
		}
		return $post_categories;
	} //end filter_post_categories
	public function filter_post_tags( $total_match, $match, $post_id) {
		$tags = array();
		foreach (get_the_tags($post_id) as $t) {
		$tag = get_tag($t);
		array_push($tags, $tag->name);
		}
		if (sizeOf($tags) > 0) {
		$post_tags = implode('|', $tags);
		} else {
		$post_tags = 'Not Assigned';
		}
		return $post_tags;
	} //end filter_post_tags
	public function filter_post_type( $total_match, $match, $post_id) {
		$post_type = get_post_type($post_id);
		return $post_type;
	}
	//END Added functions by WL @ TEQ to get extra custom data output

Then locate the section below (after my addition above it will be about line 230):

//Filters for the GTM variables
		add_filter( 'gtm_post_title', array( $this, 'filter_post_title' ), 9, 3 );
		add_filter( 'gtm_author_name', array( $this, 'filter_author_name' ), 9, 3 );
		add_filter( 'gtm_wordcount', array( $this, 'filter_wordcount' ), 9, 3 );
		add_filter( 'gtm_logged_in', array( $this, 'filter_logged_in' ), 9, 3 );
		add_filter( 'gtm_page_id', array( $this, 'filter_page_id' ), 9, 3 );
		add_filter( 'gtm_post_date', array( $this, 'filter_post_date' ), 9, 3 );

And immediately after this add my additional 3 filters

//START Added functions by WL @ TEQ to get extra custom data output
		add_filter( 'gtm_post_categories', array( $this, 'filter_post_categories'), 9, 3);
		add_filter( 'gtm_post_tags', array( $this, 'filter_post_tags'), 9, 3);
		add_filter( 'gtm_post_type', array( $this, 'filter_post_type'), 9, 3);
		//END Added functions by WL @ TEQ to get extra custom data output

And that is it.
Having made these two simple additions you can now use the values
%post_categories%
%post_tags%
%post_type%
Inside the existing Plug-in config screens and output to GTM dataLayer all the tags and categories on your Posts.
For us this was really helpful to allow us to apply different tracking tags in GTM based on what content Categories/Tags were used on the Post back in WordPress.

Happy for anyone to use this as they see fit.
And would be really happy if this could be included in a future release of the Plug-in.