Basho\Riak\Node\Config::setPort PHP Method

    public function setPort($port)
    {
        $this->port = $port;
    }

 /**
  * Build node objects with configuration to use a specific port number
  *
  * @param $port
  * @return $this
  */
 public function onPort($port)
 {
     $this->config->setPort($port);
     return $this;
 }