WordPress at a glance
filter is not described

woocommerce_vat_countries filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_vat_countries', 'filter_function_name_8265' );
function filter_function_name_8265( $array_merge ){
	// filter...

	return $array_merge;
}
$array_merge
-

Where the hook is called

WC_Countries::get_vat_countries()
woocommerce_vat_countries
woocommerce/includes/class-wc-countries.php 401
return apply_filters( 'woocommerce_vat_countries', array_merge( $eu_countries, $vat_countries ) );

Where in WP core the hook is used WooCommerce

Usage not found.