New in Symfony 3.3: Import config files with glob patterns

Contributed by
Pierre du Plessis
in #21270.

The Symfony DependencyInjection component is pretty flexible in the way you
can import other files in your application configuration. You can for example
mix config formats when needed:

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# app/config/config.yml
imports:
    - { resource: '../common/config.yml' }
    - { resource: 'dynamic-config.php' }
    - { resource: 'parameters.ini' }
    - { resource: 'security.xml' }
    # ...

You can also import entire directories to load all the resources inside them:

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# app/config/config.yml
imports:
    - { resource: '../common/' }
    - { resource: 'acme/' }
    # ...

In Symfony 3.3 we improved this feature to support importing config files with
glob patterns
. This will simplify your configuration files because you can now
import lots of different resources in a compact way:

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# app/config/config.yml
imports:
    - { resource: "*.yml" }
    - { resource: "common/**/*.xml" }
    - { resource: "/etc/myapp/*.{yml,xml}" }
    - { resource: "bundles/*/{xml,yaml}/services.{yml,xml}" }
    # ...

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