Force SSL using FORCE_SSL_ADMIN

If you are using docker-compose and the WORDPRESS_EXTRA_CONFIG as I was, when I stumbled across that error, the solution would be to use double-dollar-sign notation as described in a corresponding issue in the docker-compose repo on GitHub.

This additional environment variable is described in the “How to use this image” of the official image documentation on hub.docker.com.

Your snippet in the context of a docker-compose.yml would be:

wordpress:
  image: wordpress:latest
  environment:
    WORDPRESS_CONFIG_EXTRA: |
      define('FORCE_SSL_ADMIN', true);
      if (strpos($${_SERVER}['HTTP_X_FORWARDED_PROTO'], 'https') !== false)
      $${_SERVER}['HTTPS']='on';

of course extended with an appropriate database container and corresponding environment variables for database and user name and passwords.

This will result in the environment variable _SERVER to only expand in the container. If you use a single dollar sign, docker-compose will try to populate the value of the specified environment variable from the surrounding context into the compose file as described in the official compose docs.

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