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The Google Reporting API documentation does not give an example of how to use the PHP client to access UserActivity information given a specific UserId. There are several questions on StackOverflow about this, but I wanted to document my solution here in case it helps anyone.

I had to dive into the PHP client to figure this out.

error_reporting(E_ALL);
ini_set('display_errors', 1);

// Load the Google API PHP Client Library.
require_once __DIR__ . '/vendor/autoload.php';

session_start();

$client = new Google_Client();
$client->setAuthConfig(__DIR__ . '/your-json-key-here.json');
$client->addScope(Google_Service_Analytics::ANALYTICS_READONLY);

// Create an authorized analytics service object.
$analytics = new Google_Service_AnalyticsReporting($client);

// Call the Analytics Reporting API V4.
$response = getReport($analytics);

function getReport($analytics) {

  // Replace with your view ID. E.g., XXXX.
  $VIEW_ID = "202020192018";

  // Create the DateRange object.
  $dateRange = new Google_Service_AnalyticsReporting_DateRange();
  $dateRange->setStartDate("7daysAgo");
  $dateRange->setEndDate("today");

  // Create the ReportRequest object.
  $request = new Google_Service_AnalyticsReporting_ReportRequest();
  $request->setViewId($VIEW_ID);
  $request->setDateRanges($dateRange);
  
  // suggested by docs... but returns nothing?
  $userActivity = $analytics->userActivity;
  
  $body = new Google_Service_AnalyticsReporting_SearchUserActivityRequest();
  $body->setViewId($VIEW_ID);
  
  $user = new Google_Service_AnalyticsReporting_User();
  $user->setType('CLIENT_ID');
  $user->setUserId('1000010001000.234234234');
  
  $body->setUser($user);
  
  $output = $userActivity->search( $body );
  echo "
<pre>\n";
  print "Rows: " . $output->getTotalRows() . "\n";
  
  $sessions = $output->getSessions();  
  print "Sessions: " . count($sessions) . "\n";  

  for ( $rowIndex = 0; $rowIndex < count($sessions); $rowIndex++) { $row = $sessions[ $rowIndex ]; print "Session " . $rowIndex . ": " . $row->getDeviceCategory() . "\n";
    
    echo  "-- Activity types: " . count($row->getActivities()) . "\n";
    $activities = $row->getActivities();
    for ( $activityIndex = 0; $activityIndex < count($activities); $activityIndex++) { $activity = $activities[ $activityIndex ]; echo "-- -- Keyword: " . $activity->getKeyword() . "\t Campaign: " . $activity->getCampaign() . " Medium: " . $activity->getMedium() . "\n";
    }
    
    
  }
  
  
  echo "</pre>

";
}

function printResults($reports) {
  for ( $reportIndex = 0; $reportIndex < count( $reports ); $reportIndex++ ) { $report = $reports[ $reportIndex ]; $header = $report->getColumnHeader();
    $dimensionHeaders = $header->getDimensions();
    $metricHeaders = $header->getMetricHeader()->getMetricHeaderEntries();
    $rows = $report->getData()->getRows();

    for ( $rowIndex = 0; $rowIndex < count($rows); $rowIndex++) { $row = $rows[ $rowIndex ]; $dimensions = $row->getDimensions();
      $metrics = $row->getMetrics();
      for ($i = 0; $i < count($dimensionHeaders) && $i < count($dimensions); $i++) {
        print($dimensionHeaders[$i] . ": " . $dimensions[$i] . "\n");
      }

      for ($j = 0; $j < count( $metricHeaders ) && $j < count( $metrics ); $j++) { $entry = $metricHeaders[$j]; $values = $metrics[$j]; print("Metric type: " . $entry->getType() . "
\n" );
        for ( $valueIndex = 0; $valueIndex < count( $values->getValues() ); $valueIndex++ ) {
          $value = $values->getValues()[ $valueIndex ];
          print($entry->getName() . ": " . $value . "\n");
        }
      }
    }
  }
}