Auth Google Analytics PHP API - php

Question

I have tried the official HelloAnalytics tutorial however it doesn't work.
I am recieveing this error:
"PHP Fatal error: Class 'Google_Auth_AssertionCredentials' not found"
My Code:
// Creates and returns the Analytics service object.
// Load the Google API PHP Client Library.
require_once 'vendor/autoload.php';
// Use the developers console and replace the values with your
// service account email, and relative location of your key file.
$service_account_email = 'xxxxxxxxxxx#gmail.com';
$key_file_location = 'key_anyl.p12';
// Create and configure a new client object.
$client = new Google_Client();
$client->setApplicationName("HelloAnalytics");
$analytics = new Google_Service_Analytics($client);
// Read the generated client_secrets.p12 key.
$key = file_get_contents($key_file_location);
$cred = new Google_Auth_AssertionCredentials(
$service_account_email,
array(Google_Service_Analytics::ANALYTICS_READONLY),
$key
);
$client->setAssertionCredentials($cred);
if($client->getAuth()->isAccessTokenExpired()) {
$client->getAuth()->refreshTokenWithAssertion($cred);
}
Update:
after adding the suggested V1-master branch I am now getting the following error
Uncaught exception 'Google_Service_Exception' with message 'Error
calling GET googleapis.com/analytics/v3/management/accounts: (403)
User does not have any Google Analytics account.'

Answer 1

Problem nr 1:
if your not using composer make sure you downloaded the v1-master branch – Link
Problem nr 2:
(403) User does not have any Google Analytics account.
You are using a service account by default a service account does not have access to any google analytics accounts. You need to take the service account email address from Google Developers console and add it as a user at the ACCOUNT level it must be the ACCOUNT level in the Google Analytics website under the admin section.

Answer 2

For your problem you need to add the base directory of the library in the php 'include_path'.
Try putting this line of code before the require_once
set_include_path( get_include_path() . PATH_SEPARATOR . 'vendor/google/src' );