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<?php
    class MY_Security extends CI_Security {

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

        public function csrf_show_error()
        {
            if(session_id() == '' || !isset($_SESSION)) {
                // session isn't started
                session_start();
            }
            $_SESSION['error_msg'] = _('Form verification code is invalid. Please enter form content again.');
            header('Location: '.$_SERVER['HTTP_REFERER']);
            exit;
        }
    }