Zend FR

    /**
     * Retrieve controller directory
     *
     * Retrieves:
     * - Array of all controller directories if no $name passed
     * - String path if $name passed and exists as a key in controller directory array
     * - null if $name passed but does not exist in controller directory keys
     *
     * @param  string $name Default null
     * @return array|string|null
     */
    public function getControllerDirectory($name = null)
    {
        return $this->getDispatcher()->getControllerDirectory($name);
    }