@@ -497,6 +497,46 @@ Symfony provides the following env var processors:
497497 $container->setParameter('env(SECRETS_FILE)', '/opt/application/.secrets.json');
498498 $container->setParameter('database_password', '%env(key:database_password:json:file:SECRETS_FILE)%');
499499
500+ env(default:fallback_param:BAR) ``
501+ Retrieves the value of the parameter ``fallback_param `` when the of the ``BAR `` env var is not available:
502+
503+ ..configuration-block ::
504+
505+ ..code-block ::yaml
506+
507+ # config/services.yaml
508+ parameters :
509+ private_key :' %env(default:raw_key:file:PRIVATE_KEY)%'
510+ raw_key :' %env(PRIVATE_KEY)%'
511+ # if PRIVATE_KEY is not a valid file path, the content of raw_key is returned.
512+
513+ code-block ::xml
514+
515+ <!-- config/services.xml-->
516+ <?xml version =" 1.0" encoding =" UTF-8"
517+ <container xmlns =" http://symfony.com/schema/dic/services"
518+ xmlns : xsi =" http://www.w3.org/2001/XMLSchema-instance"
519+ xmlns : framework =" http://symfony.com/schema/dic/symfony"
520+ xsi : schemaLocation =" http://symfony.com/schema/dic/services
521+ http://symfony.com/schema/dic/services/services-1.0.xsd
522+ http://symfony.com/schema/dic/symfony
523+ http://symfony.com/schema/dic/symfony/symfony-1.0.xsd" >
524+
525+ <parameters >
526+ <parameter key =" private_key" parameter >
527+ <parameter key =" raw_key" parameter >
528+ </parameters >
529+ </container >
530+
531+ code-block ::php
532+
533+ // config/services.php
534+ $container->setParameter('private_key', '%env(default:raw_key:file:PRIVATE_KEY)%');
535+ $container->setParameter('raw_key', '%env(PRIVATE_KEY)%');
536+
537+ versionadded ::4.3
538+ The ``default `` processor was introduced in Symfony 4.3.
539+
500540It is also possible to combine any number of processors:
501541
502542..code-block ::yaml