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<?php class EventStatus { const SUCCESS = 'success'; const STOPPED = 'stopped'; const FAILED = 'failed'; private static $validStatuses = [ self::SUCCESS, self::STOPPED, self::FAILED ]; private $status = self::SUCCESS; public function __construct($aStatus = self::SUCCESS) { $this->validateStatus($aStatus); $this->status = (string) $aStatus; } public static function __callStatic($aStatus, $arguments = []) { return new static($aStatus); } public function isSuccess() { return ($this->status == self::SUCCESS); } public function isStopped() { return ($this->status == self::STOPPED); } public function isFailed() { return ($this->status == self::FAILED); } private function validateStatus($aStatus) { if (!in_array(strtolower($aStatus), static::$validStatuses)) { throw new DomainException("Invalid event status [$aStatus]"); } } } var_dump(EventStatus::Failed());