validator

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Callable rule class may look like this:

final class MyRule {
    public function __invoke(mixed $value, object $rule, ValidationContext $context): Result {
        // ...
    }
}

For simple custom rules is good solution, but there is one problem. It is not possible usage as attribute.

We can add attribute Attribute:

#[Attribute(Attribute::TARGET_CLASS | Attribute::TARGET_PROPERTY | Attribute::IS_REPEATABLE)]
final class MyRule {
    // ...

It's not enough, because validator parse attributes that implement RuleInterface only.

Suggest add new interface CallableRuleAttributeInterface and parse implementing its attributes in addition to RuleInterface.

What the reason to have two the same interfaces but with different methods' names?

RuleInterface: validate($value, $rule, $context): Result

CallableRuleInterface: __invoke($value, $rule, $context): Result

CallableRuleInterface is not rule, it's callable only.

What do you mean by it's callable only?

What do you mean by it's callable only?

It's not rule. Object does not implement RuleInterface.