Facebook asking for permissions and authentication - php

Question

I am currently making a facebook app and am having some problems with permissions. I need permission from each user to use there location and there friends locations. The code I have has worked in the past but recently seems to have stopped working. Assume my app_id and app_namespace are declared. All that happens is I am redirected to the dialog_url in the if(empty($code)) block, but to my knowledge $code should not be empty. Any help would be greatly appreciated. Thanks.
require_once('sdk/src/facebook.php');
require_once('AppInfo.php');
require_once('utils.php');
require_once('connection.php');
$facebook = new Facebook(array(
'appId' => AppInfo::appID(),
'secret' => AppInfo::appSecret(),
));
$user_id = $facebook->getUser();
if(user has ran the app before)
{
mysql_close($connection);
session_start();
$_SESSION['state'] = md5(uniqid(rand(), TRUE)); //CSRF protection
$dialog_url = "http://www.facebook.com/dialog/oauth?client_id"
. $app_id . "&redirect_uri=" . urlencode($my_url2) . "&state="
. $_SESSION['state'];
echo("<script> top.location.href='" . $dialog_url . "'</script>");
}
else
{
mysql_close($connection);
session_start();
$code = $_REQUEST["code"];
if(empty($code)) {
$_SESSION['state'] = md5(uniqid(rand(), TRUE)); //CSRF protection
$dialog_url = "http://www.facebook.com/dialog/oauth?client_id"
. $app_id . "&redirect_uri=" . urlencode($my_url) . "&scope= user_location, friends_location, offline_access" . "&state="
. $_SESSION['state'];
echo("<script> top.location.href='" . $dialog_url . "'</script>");
}
if($_REQUEST['state'] == $_SESSION['state']) {
$token_url = "https://graph.facebook.com/oauth/access_token?"
. "client_id=" . $app_id . "&redirect_uri=" . urlencode($my_url)
. "&client_secret=" . $app_secret . "&code=" . $code;
$response = #file_get_contents($token_url);
$params = null;
parse_str($response, $params);
$graph_url = "https://graph.facebook.com/me?access_token"
. $params['access_token'];
$user = json_decode(file_get_contents($graph_url));
echo("Hello " . $user->name);
}
else
{
echo("The state does not match. You may be a victim of CSRF.");
}
}

Answer 1

Seems too simple, but you have spaces in your oauth url that you've assigned to $dialog_url?