respect-validation/docs/validators/Lazy.md

Lazy

• Lazy(callable(mixed $input): Validator $validatorCreator)

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

This validator is particularly useful when creating validators 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($_POST['password'] ?? null))->isValid($_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 validators and use it everywhere.

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

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

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

Templates

Template placeholders

Placeholder	Description
subject	The validated input or the custom validator name (if specified).

Categorization

• Callables
• Nesting

Changelog

Version	Description
3.0.0	Created from KeyValue

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See also:

• Call
• CallableType
• Circuit