Add a cloudsql sample.

appengine/flexible/cloudsql/README.md

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+# Cloud SQL & Google App Engine Flexible Environment
+
+This sample application demonstrates how to use [Cloud SQL with Google App Engine Flexible Environment](https://cloud.google.com/appengine/docs/flexible/php/using-cloud-sql).
+
+## Setup
+
+Before running this sample:
+
+## Prerequisites
+
+- Install [`composer`](https://getcomposer.org)
+- Install dependencies by running:
+
+```sh
+composer install
+```
+
+## Setup
+
+Before you can run or deploy the sample, you will need to do the following:
+
+1. Create a [First Generation Cloud SQL](https://cloud.google.com/sql/docs/create-instance) instance. You can do this from the [Cloud Console](https://console.developers.google.com) or via the [Cloud SDK](https://cloud.google.com/sdk). To create it via the SDK use the following command:
+
+        $ gcloud sql instances create YOUR_INSTANCE_NAME
+
+1. Set the root password on your Cloud SQL instance:
+
+        $ gcloud sql instances set-root-password YOUR_INSTANCE_NAME --password YOUR_INSTANCE_ROOT_PASSWORD
+
+1. Update the connection string in `app.yaml` with your configuration values. These values are used when the application is deployed.
+
+## Run locally
+
+To run locally, you can either run your own MySQL server locally and set the connection string in `app.yaml`, or you can [connect to your CloudSQL instance externally](https://cloud.google.com/sql/docs/external#appaccess).
+
+```sh
+cd php-docs-samples/appengine/standard/cloudsql
+
+# set local mysql connection parameters
+export MYSQL_DSN="mysql:host=127.0.0.1;port=3306;dbname=guestbook"
+export MYSQL_USERNAME=root
+export MYSQL_PASSWORD=
+
+php -S localhost:8080
+```
+
+> be sure the `MYSQL_` environment variables are appropriate for your mysql instance
+
+Now you can view the app running at [http://localhost:8080](http://localhost:8080)
+in your browser.
+
+## Deploy to App Engine
+
+**Prerequisites**
+
+- Install the [Google Cloud SDK](https://developers.google.com/cloud/sdk/).
+
+**Deploy with gcloud**
+
+```
+gcloud config set project YOUR_PROJECT_ID
+gcloud preview app deploy
+gcloud preview app browse
+```
+
+The last command will open `https://{YOUR_PROJECT_ID}.appspot.com/`
+in your browser.

appengine/flexible/cloudsql/app.php

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+<?php
+/**
+ * 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 Silex\Application;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+// create the Silex application
+$app = new Application();
+
+$app['pdo'] = function ($app) {
+    $pdo = new PDO(
+        $app['mysql.dsn'],
+        $app['mysql.user'],
+        $app['mysql.password']
+    );
+    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+    $pdo->query('CREATE TABLE IF NOT EXISTS visits ' .
+        '(time_stamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP, user_ip CHAR(64))');
+    return $pdo;
+};
+
+$app->get('/', function (Application $app, Request $request) {
+    $ip = $request->GetClientIp();
+    // Keep only the first two octets of the IP address.
+    $octets = explode($separator = ':', $ip);
+    if (count($octets) < 2) {  // Must be ip4 address
+        $octets = explode($separator = '.', $ip);
+    }
+    if (count($octets) < 2) {
+        $octets = ['bad', 'ip'];  // IP address will be recorded as bad.ip.
+    }
+    // Replace empty chunks with zeros.
+    $octets = array_map(function ($x) { return $x == '' ? '0' : $x; }, $octets);
+    $user_ip = $octets[0] . $separator . $octets[1];
+
+    // Insert a visit into the database.
+    /** @var PDO $pdo */
+    $pdo = $app['pdo'];
+    $insert = $pdo->prepare('INSERT INTO visits (user_ip) values (:user_ip)');
+    $insert->execute(['user_ip' => $user_ip]);
+
+    // Look up the last 10 visits
+    $select = $pdo->prepare(
+        'SELECT * FROM visits ORDER BY time_stamp DESC LIMIT 10');
+    $select->execute();
+    $visits = ["Last 10 visits:"];
+    while ($row = $select->fetch(PDO::FETCH_ASSOC)) {
+        array_push($visits, sprintf('Time: %s Addr: %s', $row['time_stamp'],
+            $row['user_ip']));
+    }
+    return new Response(implode("\n", $visits), 200,
+        ['Content-Type' => 'text/plain']);
+});
+
+return $app;

appengine/flexible/cloudsql/app.yaml

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

appengine/flexible/cloudsql/composer.json

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+{
+    "require": {
+        "silex/silex": "^1.3",
+        "google/apiclient": "~2.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4",
+        "google/cloud-tools": "^0.1.0"
+    }
+}