Facebook PHP-SDK with CodeIgniter not returning $_REQUEST['signed_request']

Question

``` class Example extends CI_Controller { function __construct() { parent::__construct(); } function index() { $this->load->library('facebooklib'); $user = $this->facebooklib->getUser(); if ($user) { try { $data['user_profile'] = $this->facebooklib->api('/me'); } catch (FacebookApiException $e) { $user = null; } } var_dump($_REQUEST); if ($user) { $data['logout_url'] = $this->facebooklib->getLogoutUrl(); } else { $data['login_url'] = $this->facebooklib->getLoginUrl(); } $this->load->view('view',$data); } } ``` After clicking on the Login link, I am taken to Facebook permissions page, I accept, and I am returned to the same page with no data. ``` array(3) { ["/example"]=> string(0) "" ["PHPSESSID"]=> string(32) "33a446883d4fb1877fb6dcff6d70799a" ["ci_session"]=> string(311) "a:4:{s:10:"session_id";s:32:"d8bb3926550e3ec1b9d075b456708e9b";s:10:"ip_address";s:9:"127.0.0.1";s:10:"user_agent";s:120:"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/535.19 (KHTML, like Gecko) Chrome…

Accepted Answer

Despite all the downvotes, I was able to find the solution to this VERY serious BUG found in Facebook PHP-SDK with CodeIgniter.

So here's the solution found in CI forums: http://codeigniter.com/forums/viewthread/202370/#986781

```
    // Stop cache
    $this->ci->output->set_header("Cache-Control: private, no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
    $this->ci->output->set_header("Pragma: no-cache");

// IE Fix
    if(strpos($this->ci->agent->agent_string(), 'MSIE') !== FALSE) {
        $this->ci->output->set_header('p3p: CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV"');
    }

// Repopulate _REQUEST ... Facebook needs it.
    $request_uri = $_SERVER['REQUEST_URI'];
    $request_uri = explode('?',$request_uri);
    if(count($request_uri) > 1) {
        parse_str($request_uri[1], $_REQUEST);
    }
```

For some reason, the new PHP SDK doesn't pass $_REQUEST through CodeIgniter. There's also issues with cache, and IE not having proper header.

So this builds $_REQUEST from $_SERVER['REQUEST_URI'], which then properly passes through Facebook class and successfully returns proper data.

Facebook PHP-SDK with CodeIgniter not returning $_REQUEST['signed_request']

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