public function executeCallback()
    {
        if (method_exists($this->callbackObject, $this->callbackFunction)) {
            return call_user_func_array(array($this->callbackObject, $this->callbackFunction), $this->callbackParameters);
        }

        return null;
    }
public function executeCallback()
    {
        if (method_exists($this->callbackObject, $this->callbackFunction)) {
            return call_user_func_array(array($this->callbackObject, $this->callbackFunction), $this->callbackParameters);
        }

        return null;
    }
public function executeCallback ( ) { if ( method_exists ( $ this -> callbackObject , $ this -> callbackFunction ) ) { return call_user_func_array ( array ( $ this -> callbackObject , $ this -> callbackFunction ) , $ this -> callbackParameters ) ; } return null ; }
Activate the callback function

@return mixed
Activate the callback function