analytics.php

<?php

require_once(dirname(__FILE__) . '/google-api-php-client/autoload.php');

define('APPLICATION_NAME', '*');
define('SERVICE_ACCOUNT_NAME', '*@developer.gserviceaccount.com');
define('KEY_PATH', dirname(__FILE__) . '/p12/*.p12');
date_default_timezone_set('Asia/Tokyo');

class Analytics {

	private $service;

	function __construct($applicationName, $serviceAccountName, $keyPath) {
		$creds = new Google_Auth_AssertionCredentials(
			$serviceAccountName,
			array('https://www.googleapis.com/auth/analytics'),
			file_get_contents($keyPath)
		);

		$client = new Google_Client();
		$client->setApplicationName($applicationName);
		$client->setAssertionCredentials($creds);
		$this->service = new Google_Service_Analytics($client);
	}

	function getReport($viewId, $startDate, $endDate) {
		$result = $this->service->data_ga->get(
			'ga:' . $viewId,
			$startDate,
			$endDate,
			'ga:pageviews,ga:users,ga:screenviews'
		);

		return $result['rows'];
	}
}

$analytics = new Analytics(APPLICATION_NAME, SERVICE_ACCOUNT_NAME, KEY_PATH);
$viewId = '*';
$yesterday = @date('Y-m-d', strtotime('-1 day'));
var_dump($analytics->getReport($viewId, $yesterday, $yesterday));

イベントを取得する場合は、以下のように書く。

$result = $this->service->data_ga->get(
    'ga:' . $viewId,
    @date('Y-m-d', strtotime('-1 month')), // 開始日
    @date('Y-m-d'), // 終了日
    'ga:totalEvents',
    array(
        'dimensions'  => 'ga:eventAction,ga:eventLabel',
        'filters'     => 'ga:eventAction=@アクション名',
        'sort'        => '-ga:totalEvents',
        'max-results' => '10' // 件数
    )
);