# Source: https://docs.upsun.com/create-apps/hooks/vary-hooks-by-environment.md

# Change hooks in different environments

You might have certain commands you want to run only in certain environments.
For example enabling detailed logging in preview environments
or purging your CDN cache for production environments.

The `deploy` and `post_deploy` hooks can access all [runtime environment variables](https://docs.upsun.com../../development/variables/use-variables.md#use-provided-variables).
Use this to vary those hooks based on the environment.

Check the `PLATFORM_ENVIRONMENT_TYPE` variable to see if it's in a production environment:

```yaml  {location=".upsun/config.yaml"}
applications:
  myapp:
    hooks:
      deploy: |
        if [ "$PLATFORM_ENVIRONMENT_TYPE" = production ]; then
          # Run commands only when deploying to production
        else
          # Run commands only when deploying to development or staging environments
        fi
        # Commands to run regardless of the environment
```