php单例模式的演示代码
时间：2021-07-01 10:21:17
帮助过：11人阅读
- class User {
- static function getInstance()
- {
- if (self::$instance == NULL) { // If instance is not created yet, will create it.
- self::$instance = new User();
- }
- return self::$instance;
- }
- private function __construct()
- // Constructor method as private so by mistake developer not crate
- // second object of the User class with the use of new operator
- {
- }
- private function __clone()
- // Clone method as private so by mistake developer not crate
- //second object of the User class with the use of clone.
- {
- }
-
- function Log($str)
- {
- echo $str;
- }
- static private $instance = NULL;
- }
- User::getInstance()->Log("Welcome User");
- ?>
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