CI_Security::xss_hash PHP Method

    public function xss_hash()
    {
        if ($this->_xss_hash === NULL) {
            $rand = $this->get_random_bytes(16);
            $this->_xss_hash = $rand === FALSE ? md5(uniqid(mt_rand(), TRUE)) : bin2hex($rand);
        }
        return $this->_xss_hash;
    }