Connecting to Google Analytics via a service object (server-to-server)

google-analytics-service-object-php

// Setup the service object
$client_id = 'xxx.apps.googleusercontent.com';
$service_account_name = 'xxx@developer.gserviceaccount.com';
$client_secret = 'notasecret';
$keyfile = 'path_to_your_key.p12';
 
$client->setClientSecret($client_secret);
 
$client->setAssertionCredentials(
  new Google_Auth_AssertionCredentials(
    $service_account_name,
    array('https://www.googleapis.com/auth/analytics'),
    file_get_contents($keyfile)
  )
);
 
$client->setClientId($client_id);
$client->setScopes(array('https://www.googleapis.com/auth/analytics.readonly'));
 
$analytics = new apiAnalyticsService($client);