WordPress at a glance
filter is not described

woocommerce_matched_tax_rates filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_matched_tax_rates', 'filter_function_name_4981', 10, 6 );
function filter_function_name_4981( $matched_tax_rates, $country, $state, $postcode, $city, $tax_class ){
	// filter...

	return $matched_tax_rates;
}
$matched_tax_rates
-
$country
-
$state
-
$postcode
-
$city
-
$tax_class
-

Where the hook is called

WC_Tax::get_matched_tax_rates()
woocommerce_matched_tax_rates
woocommerce/includes/class-wc-tax.php 441
return apply_filters( 'woocommerce_matched_tax_rates', $matched_tax_rates, $country, $state, $postcode, $city, $tax_class );

Where in WP core the hook is used WooCommerce

Usage not found.