input post empty

js:

Code:

function sendLogin(id, email) {
   $.ajax({
       type: 'post',
       url: "http://www.plickapp.com/API/index.php/users/register_user/",
       data: {
           'idfb': id,
           'emailfb': email
       },
       success: function (result) {
            console.log("Ok " + result);
       },
       error: function (result) {
           console.log(result);
       }
  });
}

PHP:

Code:

public function register_post_user()
{
    ob_start();

    print_r($this->input->post());

    //few alternative i tried
    //echo $_POST['id']." ".$_POST['email'];  
    //$id = $this->input->post('id');
    //$email = $this->input->post('email');
    //echo $id." ".$email;

    $output = ob_get_clean();
    $this->output->set_output($output);
}