Check out example codes for "uncloaking google colaboratory". It will help you in understanding the concepts better.

Code Example 1

<?phprequire __DIR__ . '/vendor/autoload.php';if (php_sapi_name() != 'cli') {    throw new Exception('This application must be run on the command line.');}/** * Returns an authorized API client. * @return Google_Client the authorized client object */function getClient(){    $client = new Google_Client();    $client->setApplicationName('Google Drive API PHP Quickstart');    $client->setScopes(Google_Service_Drive::DRIVE);    $client->setAuthConfig('credentials.json');    $client->setAccessType('offline');    $client->setPrompt('select_account consent');// Load previously authorized token from a file, if it exists.    // The file token.json stores the user's access and refresh tokens, and is    // created automatically when the authorization flow completes for the first    // time.    $tokenPath = 'token.json';    if (file_exists($tokenPath)) {        $accessToken = json_decode(file_get_contents($tokenPath), true);        $client->setAccessToken($accessToken);    }// If there is no previous token or it's expired.    if ($client->isAccessTokenExpired()) {        // Refresh the token if possible, else fetch a new one.        if ($client->getRefreshToken()) {            $client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());        } else {            // Request authorization from the user.            $authUrl = $client->createAuthUrl();            printf("Open the following link in your browser:\n%s\n", $authUrl);            print 'Enter verification code: ';            $authCode = trim(fgets(STDIN));// Exchange authorization code for an access token.            $accessToken = $client->fetchAccessTokenWithAuthCode($authCode);            $client->setAccessToken($accessToken);// Check to see if there was an error.            if (array_key_exists('error', $accessToken)) {                throw new Exception(join(', ', $accessToken));            }        }        // Save the token to a file.        if (!file_exists(dirname($tokenPath))) {            mkdir(dirname($tokenPath), 0700, true);        }        file_put_contents($tokenPath, json_encode($client->getAccessToken()));    }    return $client;}// Get the API client and construct the service object.$client = getClient();$service = new Google_Service_Drive($client);// // Print the names and IDs for up to 10 files.// $optParams = array(//   'pageSize' => 10,//   'fields' => 'nextPageToken, files(id, name)'// );// $results = $service->files->listFiles($optParams);// if (count($results->getFiles()) == 0) {//     print "No files found.\n";// } else {//     print "Files:\n";//     foreach ($results->getFiles() as $file) {//         printf("%s (%s)\n", $file->getName(), $file->getId());//     }// }$fileid = "14YcSsO-_hlTCIBYgWhoSsCjpq6iiqvdZ";// $client = getClient();// $service = new Google_Service_Drive($client);// $file = $service->files->get($fileid,array('alt' => 'media'));// print($file->getBody()->getContents()."\n");$fileMetadata = new Google_Service_Drive_DriveFile(array('name' => 'input1.txt'));$emptyFile = new Google_Service_Drive_DriveFile();$content = file_get_contents('input1.txt');print($content);$file = $service->files->update($fileid, $emptyFile,array(    'data' => $content,    'mimeType' => 'text/plain',    'uploadType' => 'multipart'));?>

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