WooCommerce: Get Variation IDs By Product Category or Tag

We can get products belonging to a product category or product tag very easily. What’s much more difficult is getting single variations based on a product category or product tag, as variations… don’t have a category or tag, which belong to its “parent” variable product instead.

In this post, we will define a function that you can reuse in your custom code whenever you need to get all variation IDs based on a given product category or product tag. You can then loop through the array and return whatever info you need. Enjoy!

PHP Snippet: Retrieve List of Variations By Product Category or Tag

 * @snippet       Get Variation IDs By Taxonomy Term
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli
 * @compatible    WooCommerce 7
 * @community     https://businessbloomer.com/club/

function get_variations_from_term( $term, $taxonomy, $type ) {
    global $wpdb;
    $ids = $wpdb->get_col( "
        FROM {$wpdb->prefix}posts as p
        INNER JOIN {$wpdb->prefix}term_relationships as tr ON ( p.ID = tr.object_id OR p.post_parent = tr.object_id )
        INNER JOIN {$wpdb->prefix}term_taxonomy as tt ON tr.term_taxonomy_id = tt.term_taxonomy_id
        INNER JOIN {$wpdb->prefix}terms as t ON tt.term_id = t.term_id
        WHERE p.post_type = 'product_variation'
        AND p.post_status = 'publish'
        AND p.ID NOT IN (
			SELECT DISTINCT post_parent
			FROM {$wpdb->prefix}posts
			WHERE post_type = 'product_variation'
			AND post_status = 'publish'
        AND tt.taxonomy = '$taxonomy'
        AND t.$type = '$term'
    " );
	return $ids;

You can then use the following in order to get the variation IDs by category or tag:

get_variations_from_term( 'chairs', 'product_cat', 'slug' );
get_variations_from_term( 59, 'product_cat', 'term_id' );
// ETC

get_variations_from_term( 'shiny', 'product_tag', 'slug' );
get_variations_from_term( 'Super heavy', 'product_tag', 'name' );
// ETC

Where to add custom code?

You should place custom PHP in functions.php and custom CSS in style.css of your child theme: where to place WooCommerce customization?

This code still works, unless you report otherwise. To exclude conflicts, temporarily switch to the Storefront theme, disable all plugins except WooCommerce, and test the snippet again: WooCommerce troubleshooting 101

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Rodolfo Melogli

Business Bloomer Founder

Author, WooCommerce expert and WordCamp speaker, Rodolfo has worked as an independent WooCommerce freelancer since 2011. His goal is to help entrepreneurs and developers overcome their WooCommerce nightmares. Rodolfo loves travelling, chasing tennis & soccer balls and, of course, wood fired oven pizza. Follow @rmelogli

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