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Maintenant, vous regardez: Singleton


Real world example: There can only be one president of a country at a time. The same president has to be brought to action, whenever duty calls. President here is singleton.
Purpose: To have only one instance of this object in the application that will handle all calls.

Key: To create a singleton, make the constructor private, disable cloning, disable extension and create a static variable to house the instance

  1. namespace DesignPatterns\Creational\Singleton;
  3. final class Singleton
  4. {
  5. /**
  6.   * @var Singleton
  7.   */
  8. private static $instance;
  10. /**
  11.   * gets the instance via lazy initialization (created on first usage)
  12.   */
  13. public static function getInstance(): Singleton
  14. {
  15. if (null === static::$instance) {
  16. static::$instance = new static();
  17. }
  19. return static::$instance;
  20. }
  22. /**
  23.   * is not allowed to call from outside to prevent from creating multiple instances,
  24.   * to use the singleton, you have to obtain the instance from Singleton::getInstance() instead
  25.   */
  26. private function __construct()
  27. {
  28. }
  30. /**
  31.   * prevent the instance from being cloned (which would create a second instance of it)
  32.   */
  33. private function __clone()
  34. {
  35. }
  37. /**
  38.   * prevent from being unserialized (which would create a second instance of it)
  39.   */
  40. private function __wakeup()
  41. {
  42. }
  43. }


  1. $firstCall = Singleton::getInstance();
  2. $secondCall = Singleton::getInstance();
  4. var_dump($firstCall === $secondCall); // true

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