Usephul

Types

undefined = \empaphy\usephul\Type\Undefined::undefined: Represents an undefined value.

Represents an undefined value.


    public
        mixed
    undefined
    = \empaphy\usephul\Type\Undefined::undefined

This can be used to explicitly indicate that a variable or parameter may be undefined, differentiating it from null or other values.

You can use this as a default value to safely check that no valid value was provided:

$value = config('some_key', undefined);

This is useful in cases where null is a valid value, and you need to distinguish between "no value provided" and "value explicitly set to null".

This constant maps to the singleton case of the Undefined enum, so you can use the Undefined enum as a type hint:

function example(string|null|Undefined $param = undefined): void }