Question

require_once 'library/facebook/facebook.php';

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

$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);

How to get UID after the above code.

Answer 1

You dont need to include facebook api for this. Just to this,

$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
echo $data["user_id"];

This is a complete list of other info in $data array.

{
  "algorithm": "HMAC-SHA256",
  "expires": 1317243600,
  "issued_at": 1317239909,
  "oauth_token": "<token>",
  "page": {
    "id": "<id>",
    "liked": false,
    "admin": true
  },
  "user": {
    "country": "in",
    "locale": "en_GB",
    "age": {
      "min": 21
    }
  },
  "user_id": "<user-id>"
}