I have this test App as an iFrame in Facebook:
<?
require_once('src/facebook.php');
$config = array(
'appId' => '123',
'secret' => '123456',
'fileUpload' => true,
);
$facebook = new Facebook($config);
$user_id = $facebook->getUser();
echo "[" . $user_id . "]<br>";
?>
<!doctype html>
<html xmlns:fb="http://www.facebook.com/2008/fbml">
<head></head>
<body>
<br>
<form action="" method="post"><input name="input" type="submit" value="Submit test"></form><br>
<a href="?hallo=1">Link test</a>
</body>
</html>
I use FaceBook PHP SDK version 3.1.1-25
What I see in IE 9: I vistit this app and it displays my user ID between brackets. But when I press the submit button or when I click on the link I re-enter the app and the user-id is 0.
Only in Chrome it seems to work fine, there it keeps displaying my user id like I would expect it to do.
What am I doing wrong, or else, how can i make a multi page app and use the user-id on the next page?
One Way is you can store user in SESSION. Other way you can declare object of FACEBOOK class as global in the page you want to use facebook object and you can call "$facebook->getUser()".
global $facebook;
$user = $facebook->getUser();
echo $user;