browser.php
public function submitFormById($id, $additional = false)
    {
        if (! ($form = $this->page->getFormById($id))) {
            return false;
        }
        $success = $this->load(
                $form->getAction(),
                $form->submit($additional));

        return ($success ? $this->getContent() : $success);
    }
public function submitFormById($id, $additional = false)
    {
        if (! ($form = $this->page->getFormById($id))) {
            return false;
        }
        $success = $this->load(
                $form->getAction(),
                $form->submit($additional));

        return ($success ? $this->getContent() : $success);
    }
Submits a form by the ID.

@param string $id       The form ID. No submit button value will be sent.

@return string/boolean  Page on success.