paragraph1\phpFCM\Message::setPriority PHP Method

normal or high, use class constants as value

See also: https://firebase.google.com/docs/cloud-messaging/concept-options#setting-the-priority-of-a-message

public setPriority ( string $priority ) : Message
$priority	string	use the class constants
return	Message

    public function setPriority($priority)
    {
        $this->priority = $priority;
        return $this;
    }

Message