PHP Google drive

<?php
session_start();
include_once "templates/base.php";
 
/************************************************
  Make an API request authenticated with a service
  account.
 ************************************************/
set_include_path("../src/" . PATH_SEPARATOR . get_include_path());
require_once 'Google/Client.php';
require_once 'Google/Service/Books.php';
 
/************************************************
  ATTENTION: Fill in these values! You can get
  them by creating a new Service Account in the
  API console. Be sure to store the key file
  somewhere you can get to it - though in real
  operations you'd want to make sure it wasn't
  accessible from the webserver!
  The name is the email address value provided
  as part of the service account (not your
  address!)
  Make sure the Books API is enabled on this
  account as well, or the call will fail.
 ************************************************/
$client_id = '<YOUR_CLIENT_ID>';
$service_account_name = '';
$key_file_location = '';
 
echo pageHeader("Service Account Access");
if ($client_id == '<YOUR_CLIENT_ID>'
    || !strlen($service_account_name)
    || !strlen($key_file_location)) {
  echo missingServiceAccountDetailsWarning();
}
 
$client = new Google_Client();
$client->setApplicationName("Client_Library_Examples");
$service = new Google_Service_Books($client);
 
/************************************************
  If we have an access token, we can carry on.
  Otherwise, we'll get one with the help of an
  assertion credential. In other examples the list
  of scopes was managed by the Client, but here
  we have to list them manually. We also supply
  the service account
 ************************************************/
if (isset($_SESSION['service_token'])) {
  $client->setAccessToken($_SESSION['service_token']);
}
$key = file_get_contents($key_file_location);
$cred = new Google_Auth_AssertionCredentials(
    $service_account_name,
    array('https://www.googleapis.com/auth/books'),
    $key
);
$client->setAssertionCredentials($cred);
if($client->getAuth()->isAccessTokenExpired()) {
  $client->getAuth()->refreshTokenWithAssertion($cred);
}
$_SESSION['service_token'] = $client->getAccessToken();
 
/************************************************
  We're just going to make the same call as in the
  simple query as an example.
 ************************************************/
$optParams = array('filter' => 'free-ebooks');
$results = $service->volumes->listVolumes('Henry David Thoreau', $optParams);
echo "<h3>Results Of Call:</h3>";
foreach ($results as $item) {
  echo $item['volumeInfo']['title'], "<br /> \n";
}

<?php
session_start();
include_once "templates/base.php";
 
/************************************************
Make an API request authenticated with a service
account.
 ************************************************/
set_include_path("../src/" . PATH_SEPARATOR . get_include_path());
require_once 'Google/Client.php';
require_once 'Google/Service/Drive.php';
 
$client_id = '1077677978854-deaidfbbb36erpstbjsvqh6s1iftg36k.apps.googleusercontent.com';
$service_account_name = '1077677978854-deaidfbbb36erpstbjsvqh6s1iftg36k@developer.gserviceaccount.com';
$key_file_location = './8c320ff616a77aec2421642de64449dad6f4a9ca-privatekey.p12';
 
$client = new Google_Client();
 
if (isset($_SESSION['service_token'])) {
    $client->setAccessToken($_SESSION['service_token']);
}
$key = file_get_contents($key_file_location);
$cred = new Google_Auth_AssertionCredentials(
    $service_account_name,
    array('https://www.googleapis.com/auth/drive'),
    $key
);
$client->setAssertionCredentials($cred);
if($client->getAuth()->isAccessTokenExpired()) {
    $client->getAuth()->refreshTokenWithAssertion($cred);
}
$_SESSION['service_token'] = $client->getAccessToken();
$service = new Google_Service_Drive($client);
$newPermission= new Google_Service_Drive_Permission();
$newPermission->setType('user');
$newPermission->setRole('reader');
$newPermission->setValue('rizr19911006@gmail.com');
try {
    return $service->permissions->insert('1PXwPONvgN6yB2p6HbC98XiJsxBwPZ2WIM3QmeXjWLlo', $newPermission);
} catch (Exception $e) {
    print "An error occurred: " . $e->getMessage();
}