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<?php abstract class DomainEvent { private static $events = []; /** * @var \DateTime */ private $occurredOn; private function __construct() { static::addEvent($this); $this->occurredOn = new \DateTime(); } public static function trigger(...$args) { $event = new static(); $event->instantiate(...$args); return $event; } abstract protected function instantiate(...$args); private static function addEvent($event) { self::$events[] = $event; } public static function getEvents() { return self::$events; } /** * @return DateTime */ public function getOccurredOn() { return $this->occurredOn; } } class UserRegisteredEvent extends DomainEvent { private $data; protected function instantiate(...$args) { $this->data = $args; } } class User { /** * @var string */ private $username; /** * User constructor. * * @param string $username */ public function __construct($username) { $this->username = $username; UserRegisteredEvent::trigger($this); } /** * @return string */ public function getUsername() { return $this->username; } } $user = new User('Jimmy K. Oak'); $events = DomainEvent::getEvents();
Output for 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35
Parse error: syntax error, unexpected '.', expecting '&' or variable (T_VARIABLE) in /in/e9Rq8 on line 18
Process exited with code 255.

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