Would like to update google contacts through codeigniter application - php

Question

This is the function in home_model.php (codeigniter application)
public function edit_google_contact_oauth($oldname,$oldphone,$oldtype, $newname, $newphone, $newtype)
{
$checkname = $oldname. '(' . $oldtype. ')';
$putname = $newname. '(' . $newtype . ')';
session_start();//start session
chdir(APPPATH.'libraries');
require_once('Google/autoload.php');
require('Google/Config.php');
require('Google/Google_Client.php');
chdir(FCPATH);
$client_id = '371163949109-o19u9mlm4d6d9gi59v9inj9jjje6c46s.apps.googleusercontent.com';
$client_secret = 'k9cE1eVSMN29pQzUO4ugWoUZ';
$redirect_uri = 'http://neighborhood.apptechclient.com/restaurant/index.php/home/customer';
$client = new Google_Client();
$client -> setApplicationName('contact');
$client -> setClientid($client_id);
$client -> setClientSecret($client_secret);
$client -> setScopes('https://www.google.com/m8/feeds');
$client -> setRedirectUri($redirect_uri);
$client -> setAccessType('online');
if (isset($_GET['code'])) {
$client->authenticate($_GET['code']);
$_SESSION['token'] = $client->getAccessToken();
header('Location: ' . $redirect_uri);
}
if(!isset($_SESSION['token']))
{
$url = $client->createAuthUrl();
}else{
$client->setAccessToken($_SESSION['token']);
$token = json_decode($_SESSION['token']);
$token->access_token;
$curl = curl_init("https://www.google.com/m8/feeds/contacts/default/full?alt=json&max-results=1000&access_token=" . $token->access_token);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_TIMEOUT, 10);
$contacts_json = curl_exec($curl);
curl_close($curl);
$contacts = json_decode($contacts_json, true);
$return = array();
foreach($contacts['feed']['entry'] as $contact){
$return[] = array(
'id'=>$contact['id']['$t'],
'name' => $contact['title']['$t'],
'phone' => isset($contact['gd$phoneNumber'][0]['$t']) ? $contact['gd$phoneNumber'][0]['$t'] :false,
);
}
$count = -1;
$contactId;
foreach($return as $value) {
$count++;
if ((strcmp($value['name'], $checkname) == 0) && (strcmp($value['phone'], $oldphone) == 0)) {
$contactid=$value['id'];
}
}
}
}
I would like to update the contact details of the contact having id as $contactId by replacing that contact's name with $putname and contact's phoneNumber with $newphone.
I am looking at https://developers.google.com/google-apps/contacts/v3/#updating_contacts but I am not able to figure out what php code do I need to add to the function to make the update happen in google contacts.
Everything else is working fine. I am able to access the google contacts and retrieve the contacts and so on. I am using the google api php client.
I feel confused looking at https://developers.google.com/google-apps/contacts/v3/#updating_contacts. Please tell me the steps I need to take and what php code I need to add to successfully update the contact in Google Contacts. Thank you.