Online PHP editor | output for s7McT

<?php //my variante final class StateOptions { public function __construct(array $options) { $this->options = $options; } private function validate() { if ($this->options === []) { return false; } return true; } public function getNextState() { return $this->options['nextState'] ?? 'defaultstate'; } } class BusinessLogicServiceOOp { public function changeState(StateOptions $stateOptions) { $this->changeTo($stateOptions->getNextState()); } public function changeTo(string $changeTo) { echo $changeTo; } } //array solution class BusinessLogicServiceLegacy { public function changeState(array $stateOptions) { /** Problem here is, that no validation ran on mandatory or optional flags or on valid flags from business perspective**/ $this->changeTo($stateOptions['nextState'] ?? 'defaultstate'); } public function changeTo(string $changeTo) { echo $changeTo; } } (new BusinessLogicServiceLegacy())->changeState([]); (new BusinessLogicServiceOOp())->changeState(new StateOptions([]));