gistfile1.txt

    /**
     * Excludes our theme from the WordPress update API calls.
     *
     * @param array $request The arguments used in an HTTP request
     * @param string $url The request URL.
     * @return array $request The arguments used in an HTTP request.
     */
    public function excludeFromThemeUpdates($request, $url)
    {
        if(0 !== strpos($url, 'https://api.wordpress.org/themes/update-check'))
        {
            return $request; // Not a theme update request. Bail immediately.
        }

        $themes = unserialize($request['body']['themes']);
        unset($themes[get_option('template')]);
        unset($themes[get_option('stylesheet')]);
        $request['body']['themes'] = serialize($themes);

        return $request;
    }