woocommerce_european_union_countries filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_european_union_countries', 'filter_function_name_8553', 10, 2 );
function filter_function_name_8553( $countries, $type ){
	// filter...

	return $countries;
}

$countries

-

$type

-

Where the hook is called

return apply_filters( 'woocommerce_european_union_countries', $countries, $type );

Where in WP core the hook is used WooCommerce