Google Calendar API and php -

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i have used google calendar api user authentication porocess shows error , did not knwo reason error strictly follow instruction of google developer code please give me answer. here code authentication 

<?php require 'src/google/autoload.php'; define('application_name', 'google calendar api quickstart'); define('credentials_path', '~/.credentials/calendar-api-quickstart.json'); define('client_secret_path', 'client_secret.json'); define('scopes', implode(' ', array(     google_service_calendar::calendar_readonly) ));  /** * returns authorized api client. * @return google_client authorized client object */ function getclient() {     $client = new google_client();     $client->setapplicationname(application_name);     $client->setscopes(scopes);     $client->setauthconfigfile(client_secret_path);     $client->setaccesstype('offline');      // load authorized credentials file.     $credentialspath = expandhomedirectory(credentials_path);     if (file_exists($credentialspath)) {         $accesstoken = file_get_contents($credentialspath);     } else {         // request authorization user.         $authurl = $client->createauthurl();         printf("open following link in browser:\n%s\n", $authurl);         print 'enter verification code: ';         $authcode = trim(fgets(stdin));          // exchange authorization code access token.         $accesstoken = $client->authenticate($authcode);          // store credentials disk.         if(!file_exists(dirname($credentialspath))) {             mkdir(dirname($credentialspath), 0700, true);         }         file_put_contents($credentialspath, $accesstoken);         printf("credentials saved %s\n", $credentialspath);     }     $client->setaccesstoken($accesstoken);      // refresh token if it's expired.     if ($client->isaccesstokenexpired()) {         $client->refreshtoken($client->getrefreshtoken());         file_put_contents($credentialspath, $client->getaccesstoken());     }     return $client; }  /** * expands home directory alias '~' full path. * @param string $path path expand. * @return string expanded path. */ function expandhomedirectory($path) {     $homedirectory = getenv('home');     if (empty($homedirectory)) {         $homedirectory = getenv("homedrive") . getenv("homepath");     }     return str_replace('~', realpath($homedirectory), $path); }  // api client , construct service object. $client = getclient(); $service = new google_service_calendar($client);  // print next 10 events on user's calendar. $calendarid = 'primary'; $optparams = array(     'maxresults' => 10,     'orderby' => 'starttime',     'singleevents' => true,     'timemin' => date('c'), ); $results = $service->events->listevents($calendarid, $optparams);  if (count($results->getitems()) == 0) {     print "no upcoming events found.\n"; } else {     print "upcoming events:\n";     foreach ($results->getitems() $event) {         $start = $event->start->datetime;         if (empty($start)) {             $start = $event->start->date;         }         printf("%s (%s)\n", $event->getsummary(), $start);     } }

the output shows error :

fatal error: uncaught exception 'google_auth_exception' message 'invalid code' in c:\xampp\htdocs\lapi\odesk8\google_calendar\src\google\auth\oauth2.php:88 stack trace: #0 c:\xampp\htdocs\lapi\odesk8\google_calendar\src\google\client.php(128): google_auth_oauth2->authenticate('', false) #1 c:\xampp\htdocs\lapi\odesk8\google_calendar\test.php(33): google_client->authenticate('') #2 c:\xampp\htdocs\lapi\odesk8\google_calendar\test.php(66): getclient() #3 {main} thrown in c:\xampp\htdocs\lapi\odesk8\google_calendar\src\google\auth\oauth2.php on line 88

the sample code provided reads stdin ($authcode = trim(fgets(stdin));) if ~/.credentials/calendar-api-quickstart.json not readable or not exists

i assume not pipe in auth-code , samplecode unable find ~/.credentials/calendar-api-quickstart.json, results in exception since gets no auth-code


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