Configuration

Application configuration

The directory for all configuration files is: config/

The file config/settings.php is the main configuration file and combines the default settings with environment specific settings.

The configuration files are loaded in this order:

1. Load config/defaults.php with all default settings.

2. Load config/env.php or config/../../env.php and include the environment specific configuration file, e.g. config/development.php

3. If the constant APP_ENV is defined, load the environment specific file. This is only used to apply the phpunit test settings.

Different Environments, different Configuration Files

A typical application begins with three environments: dev, prod and test. Each environment represents a way to execute the same codebase with different configuration. It should be no surprise then that each environment loads its own individual configuration files. These different files are organized by environment:

• for the dev environment: config/local.dev.php
• for the prod environment: config/local.prod.php
• for the test environment: config/local.test.php

Environment configuration

You may be familiar with the concept of .env files. However, .env files should be considered as harmful because:

• People could put the file .env file into a public accessible directory.
• A public accessible .env file can be indexed by search engines.
• .env files are not native and much slower than PHP files.
• .env files are not intended to run on a production server. Many developers do it anyway.
• vlucas/phpdotenv is an unnecessary dependency and buggy in multi-thread PHP (read more)

Even environment variables should be considering as harmful because:

• A third-party server tool or any system-service could send a crash-report with all environment variables to foreign servers.
• Any other tool on your server could read the environment variables.
• Incorrectly configured servers could log the environment variables or even send them as error message to the browser.
• Using getenv() and putenv() is strongly discouraged due to the fact that these functions are not thread safe.

The method of getting these values is using the $_ENV and $_SERVER super-global not the getenv() function.

For security (and performance) reasons, all secret environment variables are better stored in a file called: env.php.

Create a copy of the file config/env.example.php and rename it to config/env.php

The env.php file is generally kept out of version control since it can contain sensitive API keys and passwords.

Never commit the env.php file to the version control system!

Add the file env.php to your .gitignore, so that you don’t accidentally commit it.

You also can (and should) use the env.php file on your testing, staging and production server. In this case store the server specific env.php file one directory above the project root directory. Storing the env.php file above the project directory simplifies deployment and ensures that the configuration is always in the right place and can be loaded at any time.

Errors and logging

The directory for all log files is: logs/

The default settings are stored in config/defaults.php, $settings['logger']

Read more

Slim 4 - Laminas Config