woocommerce_taxonomy_objects_product_cat filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_taxonomy_objects_product_cat', 'filter_function_name_5976' );
function filter_function_name_5976( $array ){
	// filter...

	return $array;
}

$array

-

Where the hook is called

apply_filters( 'woocommerce_taxonomy_objects_product_cat', array( 'product' ) ),

Where in WP core the hook is used WooCommerce