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[DI] Document the trim env var processor #10851

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Jan 7, 2019
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[DI] Document the trim env var processor #10851

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8 changes: 8 additions & 0 deletions configuration/external_parameters.rst
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Expand Up @@ -451,6 +451,14 @@ Symfony provides the following env var processors:
'auth' => '%env(file:AUTH_FILE)%',
));

``env(trim:FOO)``
Trims the content of ``FOO`` env var, removing whitespaces from the beginning
and end of the string. This is especially useful in combination with the
``file`` processor, as it'll remove newlines at the end of a file.

.. versionadded:: 4.3
The ``trim`` processor was introduced in Symfony 4.3.

``env(key:FOO:BAR)``
Retrieves the value associated with the key ``FOO`` from the array whose
contents are stored in the ``BAR`` env var:
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