read that only Python, Java, and Go are supported

[Richard Bernstein]

in Google Cloud App engine. Can I assume that my php app won't be able to run? Or is there a workaround?

[Ani Hatzis]

That was true a few years ago. Today PHP is supported by both, the standard environment and the flexible environment of App Engine. Look into the comparison of the two PHP environments to pick the best one for your app. Generally speaking, while the standard environment is more restrictive than the flexible environment, it also needs less effort to manage and operate the app. However, you can combine both environments in the same App Engine app (project), or even different languages, where you put each into one service (module) and deploy them together. For starters, it should be easier though to pick just one language and environment and stick with it until you feel comfortable with the platform.