getuser function return 0 at first time in browser when facebook login in php sdk suddenly

Question

At first time when i login to facebook in my browser. i called function getuser for checking purpose but i cant get it it returns zero only. it happened only when i open the browser at first time.

$facebook = new Facebook(array(
      'appId'  => 'xxxxx',
      'secret' => 'xxxxxxx',
      'cookie' => true
    ));

$here = 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    $next = preg_replace('~#.*$~s', '', $here);
    $next = preg_replace('~\?.*$~s', '', $next);
    $next = preg_replace('~/[^/]*$~s', '/login.php', $next);
$params=array(
      'scope' => 'publish_stream,user_birthday,read_stream,read_friendlists,user_about_me,email,user_checkins,friends_checkins,publish_checkins,publish_actions',
      'redirect_uri' => $next
    ); 
 $loginUrl = $facebook->getLoginUrl($params);

Answer 1

The SDK stores the facebook user ID and access token in a session, so getUser won't return 0 after auth unless you clear your cookies or re-open your browser like you've done.

You can also call destroySession() to remove the cookies in the SDK.