framework/base/Controller.php
public function getUniqueId()
    {
        return $this->module instanceof Application ? $this->id : $this->module->getUniqueId() . '/' . $this->id;
    }
public function getUniqueId()
    {
        return $this->module instanceof Application ? $this->id : $this->module->getUniqueId() . '/' . $this->id;
    }
Returns the unique ID of the controller.
@return string the controller ID that is prefixed with the module ID (if any).