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php單例模式的示範程式碼

WBOY
WBOY原創
2016-07-25 09:07:18777瀏覽
  1. class User {
  2. static function getInstance()
  3. {
  4. if (self::$instance == NULL) { // If instance is not created yet, will create it.
  5. self::$instance = new User();
  6. }
  7. return self::$instance;
  8. }
  9. private function __construct()
  10. // Constructor method as private so by mistake developer not crate
  11. // second object of the User class with the use of new operator
  12. {
  13. }
  14. private function __clone()
  15. // Clone method as private so by mistake developer not crate
  16. //second object of the User class with the use of clone.
  17. {
  18. }
  19. function Log($str)
  20. {
  21. echo $str;
  22. }
  23. static private $instance = NULL;
  24. }
  25. User::getInstance()->Log("Welcome User");
  26. ?>
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