adds front controller samples (GoogleCloudPlatform#674)

Author: bshaffer

appengine/php72/front-controller/.gcloudignore

@@ -0,0 +1,17 @@
+# 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/front-controller/README.md

@@ -0,0 +1,39 @@
+# App Engine for PHP 7.2 Front Controller sample
+
+This app demonstrates how to implement a simple front controller for legacy
+projects. The main code sample lies in [`index.php`](index.php#L13). This is one
+example of a front controller. See here for more examples:
+
+ * [front controller implementation using the Slim Framework](../slim-framework/index.php#L26)
+ * [front controller implementation for WordPress](../wordpress/files/gae-app.php#L3)
+ * [front controller implementation using regular expressions](../grpc/index.php#L11)
+
+## Setup
+
+- Install the [Google Cloud SDK](https://developers.google.com/cloud/sdk/).
+
+## Deploy
+
+### Run Locally
+
+You can run the sample locally using PHP's build-in web server:
+
+```
+# Run PHP's built-in web server
+php -S localhost:8000
+```
+
+Browse to `localhost:8000` to see a list of examples to execute.
+
+### Deploy with gcloud
+
+Deploy the samples by doing the following:
+
+```
+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. Browse to `/` to see a list of examples to execute.

appengine/php72/front-controller/app.yaml

@@ -0,0 +1,7 @@
+runtime: php72
+
+# Defaults to "serve public/index.php" and "serve index.php". Can be used to
+# serve a custom PHP front controller (e.g. "serve backend/index.php") or to
+# run a long-running PHP script as a worker process (e.g. "php worker.php").
+#
+# entrypoint: serve index.php

appengine/php72/front-controller/composer.json

@@ -0,0 +1,6 @@
+{
+    "require-dev": {
+        "phpunit/phpunit": "^5",
+        "google/cloud-tools": "^0.8.1"
+    }
+}