Lazy

Lazy(callable(mixed $input): Validatable $ruleCreator)

Validates the input using a rule that is created from a callback.

This rule is particularly useful when creating rules that rely on the input. A good example is validating whether a confirmation field matches the password field when processing data from a form.

v::key('confirmation', v::equals($_POST['password'] ?? null))->validate($_POST);

The issue with the code is that it’s hard to reuse because you’re relying upon the input itself ($_POST). That means you can create a chain of rules and use it everywhere.

The lazy() rule makes this job much simpler and more elegantly:

v::lazy(static fn($input) => v::key('confirmation', v::equals($input['password'] ?? null)))->validate($_POST);

The code above is similar to the first example, but the biggest difference is that the creation of the rule doesn't rely on the input itself ($_POST), but it will use any input that’s given to the rule

Categorization

Callables
Nesting

Changelog

Version	Description
3.0.0	Created from `KeyValue`