Customizing the PHP Runtime

You can use custom runtimes to add additional functionality to a PHP app running in the App Engine flexible environment. To configure a custom runtime, replace the following line in your app.yaml file :

  runtime: php 
 

with this line:

  runtime: custom 
 

You must also specify a base image by adding a Dockerfile in the same directory that contains the app.yaml file.

Visit the Custom runtimes documentation to learn how to define a Dockerfile in a custom runtime.

Health checking

By default, all programs running in the flexible environment receive health check requests . Make sure to write your own code to handle health check request, or disable health checks if needed.