Facebook authentication in function - getUser () returns 0

Question

I am trying to make a function in my controller to post an album on Facebook. Every time a function is available, I am redirected to REDIRECT_URI, as if $ userid = 0, even if I just logged into Facebook correctly. Is it because after logging in, it restarts the function and creates a new Facebook session, destroying the user I just got?

Thanks for any help you can provide.

 function share($id){
            if (!$id) { $this->Session->setFlash(__('Invalid id for Album', true)); 
            $this->redirect(array('action'=>'index')); }  
            $photos = $this->Album->find('all', array('conditions' => array('Album.id' => $id))); 


            $facebook = new Facebook(array('appId'=>'valid aphid', 'secret'=>'valid secret')); 
            $facebook->setFileUploadSupport(true);
            $userid = $facebook->getUser(); 

            if($userid) {               
                try {
                      $user_profile = $facebook->api('/me'); // Gets User information based on permissions the user has granted to your application.

                } 
                catch(FacebookApiException $e){
                    error_log($e);
                    // Print results if you want to debug.
                    $userid = null;
                }

            } else {

                $login_url = $facebook->getLoginUrl($params = array('redirect_uri' => REDIRECT_URI,'scope' => PERMISSIONS_REQUIRED));
                echo ("<script> top.location.href='".$login_url."'</script>");
            }

            //Create album
            $results = $facebook->api('me/albums', 'post', $photos[0]['Album']['name']);//->photos_createAlbum($albumname, '', '', 'everyone', $this->_userid); 

        }

Answer 1

Facebook PHP . :

• fb_{appid}_user_id: Facebook
• fb_{appid}_code: ,
• fb_{appid}_access_token: , API
• fb_{appid}_state: CSRF

, PHP- .

• cookie - PHPSESSID; , .
• , , .

• ( Facebook). , :

  if (!session_id()) { session_start(); }
  

Answer 2

Facebook, , , 2- . -uri getLoginUrl()! facebook, , 0 ( )

Answer 3

, , .

URL- , php: index.php http://www.xxxxx.xxx/ , http://www.xxxxx.xxx/index.php .

Answer 4

, redirect-uri Facebook getUser(), "" Facebook ( PCheese).

, , loggedin.html, loggedin.php

$facebook = new Facebook(array(
  'appId'  => 'yourAppID',
  'secret' => 'yourSecret',
));

$user = $facebook->getUser();

.

Facebook, , php, http://developers.facebook.com/docs/howtos/login/server-side-login/ ( 6)

Answer 5

, , getUser(), 0, Javascript SDK . . , , .