nginx-php-fpm/docs/scripting_templating.md

Scripting

There is often an occasion where you need to run a script on code to do a transformation once code lands in the container. For this reason we have developed scripting support. By including a scripts folder in your git repository and passing the RUN_SCRIPTS=1 flag to your command line the container will execute your scripts. Please see the repo layout guidelines for more details on how to organise this.

Using environment variables / templating

To set the variables pass them in as environment variables on the docker command line. Example:

sudo docker run -d -e 'YOUR_VAR=VALUE' richarvey/nginx-php-fpm

You can then use PHP to get the environment variable into your code:

string getenv ( string $YOUR_VAR )

Another example would be:

<?php
echo $_ENV["APP_ENV"];
?>