(hook_prefix)(key) filter-hook . WC 1.0

Usage

add_filter( '(hook_prefix)(key)', 'filter_function_name_9224', 10, 2 );
function filter_function_name_9224( $value, $that ){
	// filter...

	return $value;
}

$value

-

$that

-

Where the hook is called

$value = apply_filters( $this->get_hook_prefix() . $key, $value, $this );

Where in WP core the hook is used WooCommerce