Jetpack::add_nonce PHP Method

    function add_nonce($timestamp, $nonce)
    {
        global $wpdb;
        static $nonces_used_this_request = array();
        if (isset($nonces_used_this_request["{$timestamp}:{$nonce}"])) {
            return $nonces_used_this_request["{$timestamp}:{$nonce}"];
        }
        // This should always have gone through Jetpack_Signature::sign_request() first to check $timestamp an $nonce
        $timestamp = (int) $timestamp;
        $nonce = esc_sql($nonce);
        // Raw query so we can avoid races: add_option will also update
        $show_errors = $wpdb->show_errors(false);
        $old_nonce = $wpdb->get_row($wpdb->prepare("SELECT * FROM `{$wpdb->options}` WHERE option_name = %s", "jetpack_nonce_{$timestamp}_{$nonce}"));
        if (is_null($old_nonce)) {
            $return = $wpdb->query($wpdb->prepare("INSERT INTO `{$wpdb->options}` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, %s)", "jetpack_nonce_{$timestamp}_{$nonce}", time(), 'no'));
        } else {
            $return = false;
        }
        $wpdb->show_errors($show_errors);
        $nonces_used_this_request["{$timestamp}:{$nonce}"] = $return;
        return $return;
    }