Woocommerce custom taxonomy term in product base permalink

pb-wc-custom-tax-term-in-product-permalink.txt

/**
 * Filter to allow custom non-hierarchical taxonomy terms in the permalinks for products.
 *
 * @param  string  $permalink The existing permalink URL.
 * @param  WP_Post $post WP_Post object.
 * @return string
 */
function pb_custom_product_post_type_link( $permalink, $post ) {
	// Abort if post is not a product.
	if ( 'product' !== $post->post_type ) {
		return $permalink;
	}

	// Abort early if the placeholder rewrite tag isn't in the generated URL.
	if ( false === strpos( $permalink, '%' ) ) {
		return $permalink;
	}

	// Get the custom taxonomy term in use by this post.
	// Replace "custom_taxonomy_name" with your custom taxonomy slug.
	$taxonomy_term = get_the_terms( $post->ID, 'custom_taxonomy_name' )[0];

	if ( ! empty( $term ) ) {
		$taxonomy_term_slug = $taxonomy_term->slug;
	} else {
		// If no terms are assigned to this post, use a string instead (can't leave the placeholder there).
		$taxonomy_term_slug = _x( 'uncategorized', 'slug', 'woocommerce' );
	}

	// You can replace "%custom_taxonomy_name%" with anything else you wish to use, this is just the tag name used in Permalinks settings.
	$permalink = str_replace( '%custom_taxonomy_name%', $taxonomy_term_slug, $permalink );

	return $permalink;
}
add_filter( 'post_type_link', 'pb_custom_product_post_type_link', 10, 2 );