Selenium2Driver screenshot example

Selenium2.php

<?php

include_once 'vendor/autoload.php';
$driver = new \Behat\Mink\Driver\Selenium2Driver();
// init session:
$session = new \Behat\Mink\Session($driver);
// start session:
$session->start();
// open some page in browser:
$session->visit('http://www.facebook.com/');
$img_data = null;
$img_data = $session->getDriver()->getScreenshot();
save_image($img_data);

// get the current page URL:
//echo $session->getCurrentUrl();
// get page content:
//echo $session->getPage()->getContent();
// open another page:
$session->visit('http://www.google.com/');

// use history controlls:
$session->reload();
$session->back();
$session->forward();

$session->wait("5");
$img_data = null;
$img_data = $session->getDriver()->getScreenshot();
save_image($img_data);
$session->wait("5");
$session->stop();

function save_image($image_data) {
    $file = file_put_contents("img/" . date("Y-m-d H:m:s") . ".png", $image_data);
    return true;
}