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

Question

class Example extends CI_Controller {

    function __construct()
    {
        parent::__construct();
    }

    function index()
    {

        $this->load->         


        

Answer 1

Use this instruction this might help

$signed_request = isset($_REQUEST['signed_request']) ? $_REQUEST['signed_request'] : $this->modelfacebook->signRequest();