← Configuration and environments
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en/articles/magento-to-symfony/core/config.md
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title: 'Symfony configuration: .env and config/packages instead of env.php'
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# Configuration and environments
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Configuration has two levels. Bundle config (`config/packages/*.yaml`) describes how the framework is set up and is read when the container is compiled. Environment variables (`%env(...)%`) hold what differs between servers and are read at runtime.