public function doesFileExist($url) {
        // Setup connection
        $ch = curl_init($url);

        // We don't want to download the file, we just want to know if the file exists
        curl_setopt($ch, CURLOPT_NOBODY, true);

        // Execute cURL
        curl_exec($ch);

        // Get the HTTP status code
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        // Close the connection
        curl_close($ch);

        // If status 200 the file exists, so return true in that case, otherwise false
        return $httpCode == 200;
    }