New in Symfony 4.3: Default and Trim Env Var Processors
Warning: This post is about an unsupported Symfony version. Some of this information may be out of date. Read the most recent Symfony Docs.
Env Var processors allow to transform the value of environment variables before using them in the Symfony app configuration. They are useful for example to transform the type of the env var (which, by definition is always a string) into a more suitable type, such as an integer or a boolean. In Symfony 4.3 we added new processors to provide new transformations.
Default Env Var Processor
It returns a default value when the given env var is not defined. It uses this
env(default:DEFAULT_VALUE:ENV_VAR_NAME). You can combine it with any
of the other env vars to do advanced things like the following:
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# config/services.yaml parameters: private_key: '%env(default:default_key:file:PRIVATE_KEY)%' default_key: '%env(PRIVATE_KEY)%'
Trim Env Var Processor
It applies the
trim() PHP function to the value of the env var before
returning it. It's especially useful in combination with the
as it'll remove newlines at the end of a file:
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# config/services.yaml parameters: private_key: '%env(trim:file:PRIVATE_KEY)%'
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Next feature should be the 'rawurlencode' processor and an 'escape' processor for masking "%" characters.