adds memorystore sample (WIP)

Author: bshaffer

appengine/php72/memorystore/.gcloudignore

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+# This file specifies files that are *not* uploaded to Google Cloud Platform
+# using gcloud. It follows the same syntax as .gitignore, with the addition of
+# "#!include" directives (which insert the entries of the given .gitignore-style
+# file at that point).
+#
+# For more information, run:
+#   $ gcloud topic gcloudignore
+#
+.gcloudignore
+# If you would like to upload your .git directory, .gitignore file or files
+# from your .gitignore file, remove the corresponding line
+# below:
+.git
+.gitignore
+
+# PHP Composer dependencies:
+vendor/

appengine/php72/memorystore/README.md

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+# Cloud SQL & Google App Engine
+
+This sample application demonstrates how to use [Cloud SQL with Google App Engine](https://cloud.google.com/appengine/docs/php/cloud-sql/).
+
+## Setup
+
+Before you can run or deploy the sample, you will need to do the following:
+
+1. Create a [Memorystore instance][memorystore_create]. 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 beta redis instances create YOUR_INSTANCE_NAME --region=REGION_ID
+
+1. Update the environment variables `REDIS_HOST` and `REDIS_PORT` in `app.yaml`
+   with your configuration values. These values are used when the application is
+   deployed. Run the following command to get the values for your isntance:
+
+        $ gcloud beta redis instances describe YOUR_INSTANCE_NAME --region=REGION_ID
+
+[memorystore_create]: https://cloud.google.com/memorystore/docs/redis/creating-managing-instances
+
+## Run locally
+
+You can connect to a local database instance by setting the `REDIS_` environment
+variables to your local instance. Alternatively, you can set them to your Cloud
+Memorystore instance, but you will need to create a firewall rule for this,
+which may be a safety concern.
+
+```sh
+cd php-docs-samples/appengine/php72/memorystore
+
+# set local connection parameters
+export REDIS_HOST=127.0.0.1
+export REDIS_PORT=6379
+
+php -S localhost:8080
+```
+
+> be sure the `REDIS_` environment variables are appropriate for your Redis
+  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 app deploy
+gcloud app browse
+```
+
+The last command will open `https://{YOUR_PROJECT_ID}.appspot.com/`
+in your browser.

appengine/php72/memorystore/app.yaml

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+# This app.yaml is for deploying to instances of Cloud SQL running MySQL.
+# See app-postgres.yaml for running Cloud SQL with PostgreSQL.
+
+runtime: php72
+
+handlers:
+- url: /
+  script: index.php
+
+# [START gae_memorystore_app_yaml]
+# update with Redis instance host IP, port
+env_variables:
+  REDIS_HOST: YOUR_REDIS_HOST
+  REDIS_PORT: 6379
+# [END gae_memorystore_app_yaml]

appengine/php72/memorystore/composer.json

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+{
+    "require-dev": {
+        "phpunit/phpunit": "~5",
+        "google/cloud-tools": "^0.6",
+        "paragonie/random_compat": "^2.0"
+    }
+}