src/View/Helper/Params.php
public function fromEvent($param = null, $default = null)
    {
        if (null === $param) {
            return $this->event->getParams();
        }
        return $this->event->getParam($param, $default);
    }
public function fromEvent($param = null, $default = null)
    {
        if (null === $param) {
            return $this->event->getParams();
        }
        return $this->event->getParam($param, $default);
    }
Return all event parameters or a single event parameter.

@param string $param Parameter name to retrieve, or null to get all.
@param mixed $efault Default value to use when the parameter is missing.
@return mixed
@throws RuntimeException