fix style, use hostname for choosing tcp mode, add GAE standard docs

Author: jdpedrie

cloud_sql/postgres/pdo/README.md

@@ -79,3 +79,15 @@ Next, the following command will deploy the application to your Google Cloud pro
 ```bash
 $ gcloud beta app deploy
 ```
+
+## Google App Engine Standard
+
+To run on GAE-Standard, create an App Engine project by following the setup for these [instructions](https://cloud.google.com/appengine/docs/standard/php7/quickstart#before-you-begin).
+
+First, update `app-standard.yaml` with the correct values to pass the environment variables into the runtime.
+
+Next, the following command will deploy the application to your Google Cloud project:
+
+```bash
+$ gcloud app deploy app-standard.yaml
+```

cloud_sql/postgres/pdo/app-standard.yaml

@@ -0,0 +1,29 @@
+# Copyright 2018 Google LLC
+#
+# 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.
+
+runtime: php72
+
+# Remember - storing secrets in plaintext is potentially unsafe. Consider using
+# something like https://cloud.google.com/kms/ to help keep secrets secret.
+env_variables:
+  CLOUD_SQL_CONNECTION_NAME: ::
+  DB_USER: my-db-user
+  DB_PASS: my-db-pass
+  DB_NAME: my-db
+
+# Defaults to "serve index.php" and "serve public/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

cloud_sql/postgres/pdo/src/app.php

@@ -38,7 +38,7 @@
     $username = getenv('DB_USER');
     $password = getenv('DB_PASS');
     $dbName = getenv('DB_NAME');
-    $hostname = getenv('DB_HOSTNAME') ?: '127.0.0.1';
+    $hostname = getenv('DB_HOSTNAME');
     $cloud_sql_connection_name = getenv('CLOUD_SQL_CONNECTION_NAME');
 
     try {
@@ -49,16 +49,16 @@
         // // $cloud_sql_connection_name = getenv("CLOUD_SQL_CONNECTION_NAME");
         // // $hostname = "127.0.0.1"; // Only used in TCP mode.
 
-        if ($cloud_sql_connection_name) {
+        if ($hostname) {
+            // Connect using TCP
+            $dsn = sprintf('pgsql:dbname=%s;host=%s', $dbName, $hostname);
+        } else {
             // Connect using UNIX sockets
             $dsn = sprintf(
                 'pgsql:dbname=%s;host=/cloudsql/%s',
                 $dbName,
                 $cloud_sql_connection_name
             );
-        } else {
-            // Connect using TCP
-            $dsn = sprintf('pgsql:dbname=%s;host=%s', $dbName, $hostname);
         }
 
         // Connect to the database.
@@ -100,7 +100,7 @@
 };
 
 // Configure the templating engine.
-$container['view'] = function() {
+$container['view'] = function () {
     return Twig::create(__DIR__ . '/../views');
 };