Facebook PHP SDK session variable not passing - php

Question

fbconnect.php
include('functions.php');
connect();
require 'src/facebook.php';
if (!isset($_SESSION['user'])) {
// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
'appId' => 'xxx',
'secret' => 'xxx',
));
// Get User ID
$user = $facebook->getUser();
// We may or may not have this data based on whether the user is logged in.
//
// If we have a $user id here, it means we know the user is logged into
// Facebook, but we don't know if the access token is valid. An access
// token is invalid if the user logged out of Facebook.
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me', 'GET');
$ret = $facebook->api( array(
'method' => 'fql.query',
'query' => 'SELECT affiliations FROM user WHERE uid = me()',
));
$network = $ret['0']['affiliations']['0']['name'];
//echo $network;
$data = $facebook->api('/me', 'get', array("fields"=>"location"));
$location = $data['location']['name'];
$sql = mysql_query("SELECT * FROM xx_users WHERE user_id=$user_profile[id]");
if (mysql_num_rows($sql) == 0) {
mysql_query("INSERT INTO xx_users (name, user_id, email, network, location)
VALUES ('$user_profile[name]', '$user_profile[id]', '$user_profile[email]', '$network', '$location')");
}
else {
}
} catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
}
// Login or logout url will be needed depending on current user state.
if ($user) {
$logoutUrl = $facebook->getLogoutUrl();
} else {
// $loginUrl = $facebook->getLoginUrl();
$loginUrl = $facebook->getLoginUrl(array(
'scope' => 'email, user_location, user_work_history, user_education_history', // Permissions to request from the user
'redirect_uri' => 'http://comfyshoulderrest.com/socialexchange/home.php', // URL to redirect the user to once the login/authorization process is complete.
));
}
}
else {
$_SESSION['user'] = $user;
$_SESSION['friends'] = $facebook->api('/me/friends');
// $_SESSION['friends'] = $facebook->api('/$user/friends'); THIS GIVES THE SAME RESULT
}
data.php
include('functions.php');
connect();
session_start();
$friends = $_SESSION['friends'];
$user = $_SESSION['user'];
$arr = $friends['data'];
$friend_ids_arr = array();
foreach ($arr as $friend) { // THIS IS LINE 14
$friend_ids_arr[] = $friend['id'];
}
error:
Warning: Invalid argument supplied for foreach() in /blah/data.php on line 14
Is there anything I'm doing that's preventing the variable from passing?
EDIT
$_SESSION['user'] prints just fine, so I presume the problem lies with this line:
$_SESSION['friends'] = $facebook->api('/me/friends');

Answer 1

I'm not sure how data.php ties into fbconnect.php but maybe you want to use
$friends = $_SESSION['friends'];
before
$arr = $friends['data'];

Answer 2

From what I've seen, on fbconnect.php you didn't start the session. Try inserting session_start(); after connect().