Sunsetting

Sunsetting a feature is a period of deprecation, where the feature is still available, but is not recommended for usage. It is also displaying a warning message to alert of the disappearance, and offers alternatives.

<?php

//Deprecated: foo(): Implicitly marking parameter $i as nullable is deprecated, the explicit nullable type must be used instead
function foo(int $i = null) {}

?>

See also https://producthq.org/agile/product-management/how-to-sunset-a-feature/, https://www.intercom.com/blog/how-to-sunset-a-feature/