"facebook/webdriver": "^1.3"

use Facebook\WebDriver\Remote\DesiredCapabilities;
use Facebook\WebDriver\Remote\RemoteWebDriver;
use Facebook\WebDriver\WebDriverBy;

public function test(){
    $host = 'http://localhost:4444/wd/hub'; // this is the default
    $capabilities = DesiredCapabilities::chrome();
    $driver = RemoteWebDriver::create($host, $capabilities, 5000);
    $baseUrl = 'http://www.bilibili.com/';
    $driver->get($baseUrl);
}

# start an instance of firefox with selenium-webdriver

$browser_type = 'firefox'
$host = 'http://localhost:4444/wd/hub'

$capabilities = array(\WebDriverCapabilityType::BROWSER_NAME => $browser_type);
$driver = RemoteWebDriver::create($host, $capabilities);

$browser_type
# :firefox => firefox
# :chrome  => chrome
# :ie      => iexplore

$driver->get('http://google.com');
$driver->navigate()->to('http://google.com');

  # By name
  $driver->manage()->deleteCookieNamed('CookieName');

  # Or all of them
  $driver->manage()->deleteAllCookies();

$element = $driver->findElement(WebDriverBy::cssSelector('div.header'));
// $element will be instance of RemoteWebElement

$headerText = $element->getText();

$elements = $driver->findElements(WebDriverBy::cssSelector('ul.foo > li'));
// $elements is now array - containing instances of RemoteWebElement (or empty, if no element is found)

foreach ($elements as $element) {
    var_dump($element->getText());
}

$element = $driver->wait()->until(
    WebDriverExpectedCondition::presenceOfElementLocated(WebDriverBy::cssSelector('div.bar'))
);

$elements = $driver->wait()->until(
    WebDriverExpectedCondition::presenceOfAllElementsLocatedBy(WebDriverBy::cssSelector('ul > li'))
);

// Wait for the page tile to be 'My Page'. 

// Default wait (= 30 sec)
$driver->wait()->until(
  WebDriverExpectedCondition::titleIs('My Page')
);

// Wait for at most 10s and retry every 500ms if it the title is not correct.
$driver->wait(10, 500)->until(
  WebDriverExpectedCondition::titleIs('My Page')
);

titleIs()
titleContains()
titleMatches()

urlIs()
urlContains()
urlMatches()

presenceOfElementLocated()
presenceOfAllElementsLocatedBy()
elementTextIs()
elementTextContains()
elementTextMatches()
textToBePresentInElementValue()

visibilityOfElementLocated()
visibilityOf()
invisibilityOfElementLocated()
invisibilityOfElementWithText()

frameToBeAvailableAndSwitchToIt()
elementToBeClickable()
alertIsPresent()
numberOfWindowsToBe()

stalenessOf()
refreshed()
not()
elementToBeSelected()
elementSelectionStateToBe()

$driver->wait()->until(
    function () use ($driver) {
        $elements = $driver->findElements(WebDriverBy::cssSelector('li.foo'));

        return count($elements) > 5;
    },
    'Error locating more than five elements'
);

$driver->manage()->timeouts()->implicitlyWait(10);

$submitButton = $driver->findElement(WebDriverBy::id('Submit'));
$submitButton->click();
waitForAjax($driver); // Default is jquery same with waitForAjax($driver, 'jquery');
//waitForAjax($driver, 'prototype');
//waitForAjax($driver, 'dojo');
$anotherButton = $driver->findElement(WebDriverBy::id('secondButton'));

function waitForAjax($driver, $framework='jquery')
{
    // javascript framework
    switch($framework){
        case 'jquery':
            $code = "return jQuery.active;"; break;
        case 'prototype':
            $code = "return Ajax.activeRequestCount;"; break;
        case 'dojo':
            $code = "return dojo.io.XMLHTTPTransport.inFlight.length;"; break;
        default:
            throw new Exception('Not supported framework');
    }

    do {
        sleep(2);
    } while ($driver->executeScript($code));
}

function waitForAjax($driver, $framework='jquery')
{
    // javascript framework
    switch($framework){
        case 'jquery':
            $code = "return jQuery.active;"; break;
        case 'prototype':
            $code = "return Ajax.activeRequestCount;"; break;
        case 'dojo':
            $code = "return dojo.io.XMLHTTPTransport.inFlight.length;"; break;
        default:
            throw new Exception('Not supported framework');
    }

    // wait for at most 30s, retry every 2000ms (2s)
    $driver->wait(30, 2000)->until(
        function ($driver, $code) {
            return !$driver->executeScript($code);
        }
    );
}    

$full_screenshot = TakeScreenshot();
$screenshot_of_element = TakeScreenshot($this->driver->findElement(WebDriverBy::xpath("//img[@class='test']"));

public function TakeScreenshot($element=null) {
    // Change the Path to your own settings
    $screenshot = $this->TempDirectoryPath . time() . ".png";

    // Change the driver instance
    $this->driver->takeScreenshot($screenshot);
    if(!file_exists($screenshot)) {
        throw new Exception('Could not save screenshot');
    }
    
    if( ! (bool) $element) {
        return $screenshot;
    }
    
    $element_screenshot = $this->TempDirectoryPath . time() . ".png"; // Change the path here as well
    
    $element_width = $element->getSize()->getWidth();
    $element_height = $element->getSize()->getHeight();
    
    $element_src_x = $element->getLocation()->getX();
    $element_src_y = $element->getLocation()->getY();
    
    // Create image instances
    $src = imagecreatefrompng($screenshot);
    $dest = imagecreatetruecolor($element_width, $element_height);

    // Copy
    imagecopy($dest, $src, 0, 0, $element_src_x, $element_src_y, $element_width, $element_height);
    
    imagepng($dest, $element_screenshot);
    
    // unlink($screenshot); // unlink function might be restricted in mac os x.
    
    if( ! file_exists($element_screenshot)) {
        throw new Exception('Could not save element screenshot');
    }
    
    return $element_screenshot;
}