woocommerce_product_related_posts_relate_by_tag filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_product_related_posts_relate_by_tag', 'filter_function_name_651', 10, 2 );
function filter_function_name_651( $true, $product_id ){
	// filter...

	return $true;
}

$true

-

$product_id

-

Where the hook is called

$tags_array = apply_filters( 'woocommerce_product_related_posts_relate_by_tag', true, $product_id ) ? apply_filters( 'woocommerce_get_related_product_tag_terms', wc_get_product_term_ids( $product_id, 'product_tag' ), $product_id ) : array();

Where in WP core the hook is used WooCommerce