@@ -382,6 +382,20 @@ a new ``locale`` parameter is added to the ``config/services.yaml`` file).
382382 They are useful when working with :ref:`Compiler Passes </service_container/compiler_passes>`
383383 to declare some temporary parameters that won't be available later in the application.
384384
385+ Configuration parameters are usually validation-free, but you can ensure that
386+ essential parameters for your application's functionality are not empty::
387+
388+ // ContainerBuilder
389+ $container->parameterCannotBeEmpty('app.private_key', 'Did you forget to configure a non-empty value for "app.private_key" parameter?');
390+
391+ If a non-empty parameter is empty (e.g. ``null``, an empty string ``''``, or an empty
392+ array ``[]``), Symfony will throw an exception with the custom error message when
393+ attempting to retrieve the value of this parameter.
394+
395+ .. versionadded:: 7.2
396+
397+ Validating non-empty parameters was introduced in Symfony 7.2.
398+
385399.. seealso::
386400
387401 Later in this article you can read how to