title: Get the Email-Id of the Client PHP
body: <p>I want So I've followed the instructions given on the following page<br><br>
  <a href="https://developers.google.com/api-client-library/php/auth/web-app" rel="nofollow noreferrer">https://developers.google.com/api-client-library/php/auth/web-app</a><br><br>
  However, it isn't too clear on how to get the currently signed in user's email id. The current scopes that I've set are for reading the person's profile, his email-id and gmail.readonly (reading all emails).<br>
  My question is, say I have the access token, and I've initialized the Google_Client object by setting the access token, how do I get the currently sign-in user's email?</p>