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

According to one of the answers in this post, CodeIgniter purges the $_REQUEST variable for security reasons. I assume it's related to the automatic input filtering described in the Codeigniter Manual here, but it's not specifically mentioned there either though. I am unsure whether setting

 $config['global_xss_filtering'] = TRUE;

in config.php affects it or not (I have it set to TRUE in mine), but at least now you/we know why the $_REQUEST variable is not available.

Interestingly, I have the FB SDK library in my CIApplication/libraries/ folder and it seems to access the $_REQUEST variable fine, just not in my views or controllers.

Was looking for the answer to the same question when I came across this post - and yours is a perfectly valid, good question too!

Cheers Matt