How to save a page in PHP Selenium?

Question

PHP

I installed Selenium in php, I go to the url account by entering my login and password, then I need to save the resulting page. it has the desired multidimensional array.
And how to save the page opened in the browser in selenium? getcontent does not work, loads from another place without logging in, I found this command also does not work RemoteWebDriver::get_page_source() .may be outdated.