1. Go to this page and download the library: Download facebook/webdriver library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
facebook / webdriver example snippets
// This would be the url of the host running the server-standalone.jar
$host = 'http://localhost:4444/wd/hub'; // this is the default url and port where Selenium server starts