title: Including files with symfony2
body: <p>I'm doing a bundle in symfony2 with google drive api. I have a class in Utils folder: Authentication which interact with the files from google (that I put in that exact same folder) and I wanna include those files in my Authentication.php.</p>
  
  <p>I include like this:</p>
  
  <pre><code>require_once 'google-api-php-client/src/Google_Client.php';
  require_once 'google-api-php-client/src/contrib/Google_DriveService.php';
  require_once 'google-api-php-client/src/contrib/Google_Oauth2Service.php';
  </code></pre>
  
  <p>But I get this error:</p>
  
  <blockquote>
    <p><strong>Fatal error:</strong> <code>main()</code>: Failed opening required 'google-api-php-client\src\Google_Client.php'</p>
  </blockquote>