<?php
function signin($browser, $username = 'test', $password = 'test') {  
  $browser = new sfTestBrowser();
  $browser->get('/login');
  
  $dom = $browser->getResponseDom();
  $token = $dom->getElementsByTagName('input')->item(0)->getAttribute('value');
  $signin = array('username' => $username, 'password' => $password, '_csrf_token' => $token);

  return $browser->
    info(sprintf('Signin user using username "%s" and password "%s"', $username, $password))->
    click('signin', array('signin' => $signin))->
    isRedirected();
}