Online PHP editor | output for AC3p8

<?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===null) { $errorList->add($fieldName, new Error($result)); } } } return $errorList; } }