Exclude category or tag from related products in WooCommerce

functions.php

<?php // do not copy this line

/**
 * Both functions below work the same, they just apply to categories and tags respectively. 
 * They exclude the defined IDs from being included in related products in WooCommerce. 
 *
 * Note: The results are initially cached, so add this and then clear transients before saying it doesn't work. 
 * 
 * @link   https://gist.github.com/jessepearson/dcf49d766cd1647465655fe9a14e51f2
 * @param  [array] $categories/$tags The array of categories or tags that are being used for related products. 
 * @return [array]             The filtered array of results. 
 */
function jp_exclude_categories_from_related( $categories ) {
	
	// Define your category IDs you'd like to have excluded.
	$exclude_cats = array( 100, 101, 102 );

	foreach( $categories as $index => $cat ){
		if( in_array( $cat, $exclude_cats ) ){
			unset( $categories[ $index ] );
		}
	}

	return $categories;
}
add_filter( 'woocommerce_get_related_product_cat_terms', 'jp_exclude_categories_from_related' );

function jp_exclude_tags_from_related( $tags ) {
	
	// Define your tag IDs you'd like to have excluded.
	$exclude_tags = array( 100, 101, 102 );

	foreach( $tags as $index => $tag ){
		if( in_array( $tag, $exclude_tags ) ){
			unset( $tags[ $index ] );
		}
	}

	return $tags;
}
add_filter( 'woocommerce_get_related_product_tag_terms', 'jp_exclude_tags_from_related' );

The tag ID! I found a similar snippet but it was including slugs as a string in the exclude_tags array. This worked for me on Woo 4.6. Thank you!

Doesn't work for me when i exclude by cat ID and the product also has one or more tags. When i remove the tags, it works.