WebDriver\Session::open PHP Method

    public function open($url)
    {
        $this->curl('POST', '/url', array('url' => $url));
        return $this;
    }

 /**
  * Visit specified URL.
  *
  * @param   string  $url    url of the page
  */
 public function visit($url)
 {
     $this->wdSession->open($url);
 }