diff --git a/configuration/env_var_processors.rst b/configuration/env_var_processors.rst
index 236b5c166b0..a846933474a 100644
--- a/configuration/env_var_processors.rst
+++ b/configuration/env_var_processors.rst
@@ -59,7 +59,7 @@ Built-In Environment Variable Processors
Symfony provides the following env var processors:
``env(string:FOO)``
- Casts ``FOO`` to a string:
+ Casts ``FOO`` to a string or null:
.. configuration-block::
@@ -104,8 +104,8 @@ Symfony provides the following env var processors:
};
``env(bool:FOO)``
- Casts ``FOO`` to a bool (``true`` values are ``'true'``, ``'on'``, ``'yes'``
- and all numbers except ``0`` and ``0.0``; everything else is ``false``):
+ Casts ``FOO`` to a bool or null (``true`` values are ``'true'``, ``'on'``, ``'yes'``
+ and all numbers except ``0`` and ``0.0``; everything else is ``false``; except for ``null``, which stays ``null``):
.. configuration-block::
@@ -150,8 +150,8 @@ Symfony provides the following env var processors:
};
``env(not:FOO)``
- Casts ``FOO`` to a bool (just as ``env(bool:...)`` does) except it returns the inverted value
- (falsy values are returned as ``true``, truthy values are returned as ``false``):
+ Casts ``FOO`` to a bool or null (just as ``env(bool:...)`` does) except it returns the inverted value
+ (falsy values are returned as ``true``, truthy values are returned as ``false``, ``null`` stays ``null``):
.. configuration-block::
@@ -185,10 +185,10 @@ Symfony provides the following env var processors:
$container->setParameter('safe_for_production', '%env(not:APP_DEBUG)%');
``env(int:FOO)``
- Casts ``FOO`` to an int.
+ Casts ``FOO`` to an int or null.
``env(float:FOO)``
- Casts ``FOO`` to a float.
+ Casts ``FOO`` to a float or null.
``env(const:FOO)``
Finds the const value named in ``FOO``:
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