TYPO3 v9 has reached its end-of-life September 30th, 2021 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
Using Environment Variables in Site Configuration¶
Environment Variables in site configuration allows setting placeholders for configuration options that get replaced by environment variables specific to the current environment.
The format for environment variables is
%env(ENV_NAME)%. Environment variables may be used to replace
complete values or parts of a value.
When using environment variables in conditions, make sure to quote them correctly:
condition: '"%env(my_env)%" == "my_comparison_string"'
TYPO3 does not provide a loader for .env files - you have to take care of loading them yourself. Common options include setting environment configuration via server configuration or using vlucas/phpdotenv.