woocommerce_product_categories_widget_args filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_product_categories_widget_args', 'filter_function_name_4901' );
function filter_function_name_4901( $list_args ){
	// filter...

	return $list_args;
}

$list_args

-

Where the hook is called

wp_list_categories( apply_filters( 'woocommerce_product_categories_widget_args', $list_args ) );

Where in WP core the hook is used WooCommerce