woocommerce_matched_rates filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_matched_rates', 'filter_function_name_5551', 10, 3 );
function filter_function_name_5551( $matched_tax_rates, $tax_class, $customer ){
	// filter...

	return $matched_tax_rates;
}

$matched_tax_rates

-

$tax_class

-

$customer

-

Where the hook is called

return apply_filters( 'woocommerce_matched_rates', $matched_tax_rates, $tax_class, $customer );

Where in WP core the hook is used WooCommerce