' => ''] to ['value' => '', 'label' => ''] * * @return array */ public function toOptionArray(): array { $result = []; foreach ($this->toOptionHash() as $key => $value) { $result[] = ['value' => $key, 'label' => $value]; } return $result; } /** * Return array of options * * @return array Format: array(array('' => ''), ...) */ abstract public function toOptionHash(): array; }