Add an analytics sample.

For https://cloud.google.com/appengine/docs/flexible/php/integrating-with-analytics

Author: SurferJeffAtGoogle

appengine/flexible/analytics/README.md

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+# Google Analytics and Google App Engine Flexible Environment
+
+This sample application demonstrates how track events with Google Analytics
+when running in Google App Engine Flexible Environment.
+
+## Prerequisites
+
+- Install [`composer`](https://getcomposer.org)
+- Install dependencies by running:
+
+```sh
+$ composer install
+```
+
+## Deploy to App Engine
+
+**Prerequisites**
+
+- Install the [Google Cloud SDK](https://developers.google.com/cloud/sdk/).
+
+- [Create a Google Analytics Property and obtain the Tracking ID](
+    https://support.google.com/analytics/answer/1042508?ref_topic=1009620).
+    Include the environment variables in app.yaml with your Tracking ID.
+    For example:
+
+    ```
+    env_variables:
+        GA_TRACKING_ID: your-tracking-id
+    ```
+
+    Before running the sample app locally, set the environment variables required by the app:
+
+    ```
+    export GA_TRACKING_ID=your-tracking-id
+    ```
+
+**Deploy with gcloud**
+
+```
+$ gcloud config set project YOUR_PROJECT_ID
+$ gcloud preview app deploy
+```

appengine/flexible/analytics/app.php

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+
+/**
+ * Copyright 2015 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use GuzzleHttp\Client;
+use Silex\Application;
+use Silex\Provider\TwigServiceProvider;
+use Symfony\Component\HttpFoundation\Request;
+
+// create the Silex application
+$app = new Application();
+$app->register(new TwigServiceProvider());
+$app['twig.path'] = [ __DIR__ ];
+
+$app->get('/', function (Application $app, Request $request) {
+    /** @var Twig_Environment $twig */
+    $twig = $app['twig'];
+    $baseUri = 'http://www.google-analytics.com/';
+    $client = new GuzzleHttp\Client(['base_uri' => $baseUri]);
+    $form = [
+        'v' => '1',  # API Version.
+        'tid' => $app['GA_TRACKING_ID'],  # Tracking ID / Property ID.
+        # Anonymous Client Identifier. Ideally, this should be a UUID that
+        # is associated with particular user, device, or browser instance.
+        'cid' => '555',
+        't' => 'event',  # Event hit type.
+        'ec' => 'Poker',  # Event category.
+        'ea' => 'Royal Flush',  # Event action.
+        'el' => 'Hearts',  # Event label.
+        'ev' => 0,  # Event value, must be an integer
+    ];
+    $response = $client->request('POST', 'collect', ['form_params' => $form]);
+    return $twig->render('index.html.twig', [
+            'base_uri' => $baseUri,
+            'response_code' => $response->getStatusCode(),
+            'response_reason' => $response->getReasonPhrase()]);
+});
+
+return $app;

appengine/flexible/analytics/app.yaml

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+runtime: php
+vm: true
+
+runtime_config:
+  document_root: web

appengine/flexible/analytics/composer.json

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+{
+    "require": {
+        "silex/silex": "^1.3",
+        "twig/twig": "^1.24",
+        "guzzlehttp/guzzle": "^6.2",
+        "symfony/css-selector": "^3.1"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4",
+        "google/cloud-tools": "^0.1.0"
+    }
+}