Help with FB connect

**midhul** · 06-07-2010, 05:11 PM

Hey guys,

This is not any topic realred to the core depths of facebook connect, but simple one that any non confused php programmer can answer

Please refer to this doc regarding single sign on feature of fb connect: http://developers.facebook.com/docs/guides/web

actually I was building an app which uses fb login button then requests user email and send it to another form to process.

But I am abit confused about how to request the user data after the log on has been made.
Here is the code:

<?php

define('FACEBOOK_APP_ID', 'your application id');
define('FACEBOOK_SECRET', 'your application secret');

function get_facebook_cookie($app_id, $application_secret) {
$args = array();
parse_str(trim($_COOKIE['fbs_' . $app_id], '\\"'), $args);
ksort($args);
$payload = '';
foreach ($args as $key => $value) {
if ($key != 'sig') {
$payload .= $key . '=' . $value;
}
}
if (md5($payload . $application_secret) != $args['sig']) {
return null;
}
return $args;
}

$cookie = get_facebook_cookie(FACEBOOK_APP_ID, FACEBOOK_SECRET);

?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:fb="http://www.facebook.com/2008/fbml">
<body>
<?php if ($cookie) { ?>
Your user ID is <?= $cookie['uid'] ?>
<?php } else { ?>
<fb:login-button></fb:login-button>
<?php } ?>

<div id="fb-root"></div>
<script src="http://connect.facebook.net/en_US/all.js"></script>
<script>
FB.init({appId: '<?= FACEBOOK_APP_ID ?>', status: true,
cookie: true, xfbml: true});
FB.Event.subscribe('auth.login', function(response) {
window.location.reload();
});
</script>
<?php

$user = json_decode(file_get_contents(
'https://graph.facebook.com/me?wrap_access_token=' .
$cookie['oauth_access_token']))->me;
register_user($user->id, $user->email, $user->name, $user->username,
$user->birthday_date);
echo $user->email;
?>
</body>
</html>

as you can see after requesting log on with the fb connect button, I have use a php code to request and echo the users email:

$user = json_decode(file_get_contents(
'https://graph.facebook.com/me?wrap_access_token=' .
$cookie['oauth_access_token']))->me;
register_user($user->id, $user->email, $user->name, $user->username,
$user->birthday_date);
echo $user->email;

I mean I used echo $user->email, but it is not working

I think I have used the wrong variable.

Can some please help me and tell me how to do it?

Thanks alot in advance

**midhul** · 06-07-2010, 05:19 PM

Ps- please ignore the stars "*" there is a bug In The forum, i am unable to edit my post

**djr33** · 06-07-2010, 09:53 PM

I replaced all of the '*'s with spaces in your post. I'm not sure why that happened, but for now at least the post is formatted correctly.

**midhul** · 06-08-2010, 02:42 AM

Thhans alot

Any idea where I am wrong?

**djr33** · 06-08-2010, 05:03 AM

I'm not exactly sure of the problem. Do you know how to use classes in PHP? $user->email is part of the class. Once defined, that acts as an internal variable within the $user object.
I don't know enough about facebook connect to be sure that's right, but I don't see anything (obvious) wrong in your code.

However, json_decode() creates arrays, not objects, right? So many you mean $user['email']??

Try <?php print_r($user); ?> to see if this outputs an array. If so, it's an array. If you get some error, it's an object like I said above.

Note: json is a function for javascript. It may work in PHP, but I've never used it, so if that doesn't work you might need to find another way. But I think this is ok-- it's just possible that this is part of the problem.

**midhul** · 06-08-2010, 10:09 AM

Thanks for your time

But I tried |||| print_r($user); ||| before, it does not output anything.
Not even PHP error.

Can you see this please: http://developers.facebook.com/docs/guides/web
It has info about how the FB connect 'json' function works

Thanks alot.

**djr33** · 06-08-2010, 06:37 PM

Don't they have a forum there? This isn't really a question for php, but a question for how FB connect works. I've never used it, so aside from learning everything about it, I'm not sure how to help. Maybe someone else here knows...

**Ron14** · 06-13-2010, 01:28 AM

The example code has changed. Try the following:

$user = json_decode(file_get_contents(

    'https://graph.facebook.com/me?access_token=' .

    $cookie['access_token']))->id;

use echo $user to get the id.

for the email it was a bit different. I found this to work:

$user = json_decode(file_get_contents(

    'https://graph.facebook.com/me?access_token=' .

    $cookie['access_token']));

then echo $user->mail after adding an extended permisson for email.

<fb:login-button perms="email"></fb:login-button>

**vishnuk** · 06-14-2010, 11:15 AM

Warning: file_get_contents(https://graph.facebook.com/me?wrap_access_token=) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request in

can any one help

**djr33** · 06-14-2010, 07:27 PM

The URL is incorrect. The error message tells you this. Look at the documentation again.
Also, this might be the right URL, but your access token is missing: add this to the end of the URL.