User email is not coming in facebook login api

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PHP

Facebook-API

I tried to add Facebook credential to my website. But except name and Facebook ID, other details are not returned.

include_once("includes/access_login.php");
include_once("facebook/facebook.php");
define('YOUR_APP_ID', '16604785137509701');


$facebook = new Facebook(array(
'appId' => '16607854137509701',
'secret' => '5cfdea08254bb6637d064924a73e5c508',
));

$userId = $facebook->getUser();

echo "FB User Id : " . $userId;

$userInfo = $facebook->api('/me');

echo "

";
    print_r($userInfo);
    echo "

";

?>

enter image description here

I have used these things. I am getting

FB User Id : 902204443331431759

Array
(
    [name] => sradha
    [id] => 902204443331431759
)

but not the other details. Suggest me