title: How to get user's profile pic url using graph api
body: <p>Hi i m trying to get url of user's profile pic so I use following code</p>
  
  <pre><code>$userinfo = $facebook-&gt;api("/me/picture?type=large");
  var_dump($userinfo);
  </code></pre>
  
  <p>but instead of returning url it returns NULL. Please help me why this is happening.</p>
  
  <p>Thank you.</p>