validate()

validate() is the primary single-error entry point for every validator. It runs requiredness, normalization, shared constraints, conditional rules, and the validator-specific type check through one pipeline.

Standalone value

use Fynix\Rule;

$error = Rule::string('firstName')
    ->min(2)
    ->max(50)
    ->validate('A');

The method returns a ValidationError when validation fails, or null when the value is valid.

Object-bound value

Bind the rule to an object when the value should be read from a property:

$error = Rule::for($user)
    ->string('firstName')
    ->min(2)
    ->max(50)
    ->validate();

The bound object is also supplied to cross-field constraints such as sameAs() and requiredIf().

Complete object validation

Use ValidationHandler::validate() when the goal is to validate every rule registered for a DTO and its nested objects:

$errors = ValidationHandler::validate($user);

ValidatorBase::validate() handles one rule. ValidationHandler::validate() handles the complete object graph.

Pipeline order

The rule runs shared requiredness and normalization, HTML and length checks where applicable, common constraints, conditional rules, and then the validator-specific type check. validate() returns only the first error from that pipeline.

$rule = Rule::string('displayName')
    ->label('Display name')
    ->required()
    ->min(3);

$error = $rule->validate('A');

if ($error !== null) {
    echo $error->code;
}

Use validateAll() when the caller needs every applicable error from the same rule.