update for app engine flex

Author: jdpedrie

cloud_sql/mysql/pdo/README.md

@@ -65,14 +65,14 @@ $ php -S localhost:8080
 
 Navigate towards http://localhost:8080 to verify your application is running correctly.
 
-## 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).
+To run on App Engine Flex, 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.yaml` with the correct values to pass the environment variables into the runtime.
 
+Then, make sure that the service account `service-{PROJECT_NUMBER}>@gae-api-prod.google.com.iam.gserviceaccount.com` has the IAM role `Cloud SQL Client`.
+
 Next, the following command will deploy the application to your Google Cloud project:
 
 ```bash
-$ gcloud app deploy
+$ gcloud beta app deploy
 ```

cloud_sql/mysql/pdo/app.yaml

@@ -12,17 +12,24 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: php72
+runtime: php
+env: flex
 
 # Remember - storing secrets in plaintext is potentially unsafe. Consider using
 # something like https://cloud.google.com/secret-manager/ to help keep secrets
 # secret.
 env_variables:
-  CLOUD_SQL_CONNECTION_NAME: ::INSTANCE>
+  CLOUD_SQL_CONNECTION_NAME: "::DATABASE>"
   DB_USER: my-db-user
   DB_PASS: my-db-pass
   DB_NAME: my-db
 
+beta_settings:
+  cloud_sql_instances: "::"
+
+runtime_config:
+  document_root: .
+
 # 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").