test.php

<?php
require_once 'lib/__init__.php';
$wd_host = 'http://localhost:4444/wd/hub'; // this is the default
$browser = "firefox";
for ($i=1;$i<=100;$i++) {
    $browser = $browser=="firefox"?"chrome":"firefox";
    $capabilities = array(WebDriverCapabilityType::BROWSER_NAME => $browser);
    $driver = new WebDriver($wd_host, $capabilities);
    $driver->get('http://baby.steals.com/');
    $driver->findElement(WebDriverBy::className("login_link"))->click();
    $driver->wait(10, 500)->until(
        function ($driver) {
            return $driver->findElement(WebDriverBy::cssSelector('div[title="Google"]'));
        }
    );
    $driver->findElement(WebDriverBy::cssSelector('div[title="Google"]'))->click();
    $driver->switchTo()->window($driver->getWindowHandles()[1]);
    sleep(1);
    $driver->findElement(WebDriverBy::id("Email"))->sendKeys("my email");
    $driver->findElement(WebDriverBy::id("Passwd"))->sendKeys("im not really going to tell you my password");
    $driver->findElement(WebDriverBy::id("signIn"))->click();
    $driver->switchTo()->window($driver->getWindowHandles()[0]);
    $driver->wait(10, 500)->until(
        function ($driver) {
            return $driver->findElement(WebDriverBy::cssSelector('.myacct-loggedin'));
        }
    );
    echo "logged in $i times\n";
    $driver->quit();
}