failing to get $attrs

login.php

<?php
header('Content-Type: application/json');

require("oneid.php");

$attrs = OneID_Response();
// here you do whatever you need to log the user in.
session_start();

$_SESSION['email'] = $attrs['ATTR']["personal_info"]['email'];
$_SESSION['attr'] = $attrs;
$_SESSION['uid'] = $attrs['UID'];

// return the redirect to the next page
//echo OneID_Redirect('account.php');
// $_SESSION['attr']

echo "{ \"errorcode\" : 0 , \"error\": \"success\" , \"attr\" : ", json_encode($attrs), "}";

?>