facebook->getUser() returning 0

Question

Whenever I try to login a prompt opens asking for the basic permissions, after that its being redirected to my redirect_uri with an URL

=\">http://loc

Answer 1

After several hours, the solution for me was (Let's say my site is http://www.site123.com):

Settings @ https://developers.facebook.com

1. App Domain: site123.com (even blank it will work though)
2. Site URL: http://site123.com IMPORTANT : NOT http://www.site123.com

PHP Code - fb_config.php

//Declarations
$app_id     = "{you AppID}";
$app_secret = "{your App Secret}";
$site_url   = "http://site123.com/receive_data_from_facebook.php";

//New Facebook
$facebook = new Facebook(array(
'appId'     => $app_id,
'secret'    => $app_secret,
'cookie'    => TRUE, /* Optional */
'oath'      => TRUE  /* Optional */
));

//Login URL
$loginUrl = $facebook->getLoginUrl(array(
    'scope'     => 'email,user_birthday',
    'redirect_uri'  => $site_url,
    ));

//Get FacebookUserID
$fbuser = $facebook->getUser();

Important Note Also: I had some issues with Firefox $facebook->getUser() was 0 even my code was working on Chrome. But after cleaning Firefox cache, it worked nicely!

Hope it helps.