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<?php class Validator { private array $rules; public function __construct(array $rules) { $this->rules = $rules; } public function validate (Enrollee $enrollee): ErrorList { $errorList = new ErrorList(); foreach ($this->rules as $fieldName => $checklist) { foreach ($checklist as $rule) { $result = $rule($enrollee->get($fieldName)); if ($result) { $errorList->add($fieldName, $result); } } } return $errorList; } }