[php學習]單例模式

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/** 2.Singleton*/class Singleton{private static $instance = null;public static function getInstance(){if (!isset(self::$instance)){              $c = __CLASS__;              self::$instance = new $c;           }  return self::$instance;}public function eventResult($id){return $id;}protected function __construct()    {    }    private function __clone()    {    }    private function __wakeup()    {    }}class SingletonChild extends Singleton{}$obj = Singleton::getInstance();var_dump($obj === Singleton::getInstance());           $anotherObj = SingletonChild::getInstance();var_dump($anotherObj === Singleton::getInstance());     var_dump($anotherObj === SingletonChild::getInstance()); $objSingle = Singleton::getInstance();$result = $objSingle->eventResult(100);print_r($result);

注意的是對於：__construct，__clone，__wakeup 的修飾符設定防止被執行個體破壞單例。

[php學習]單例模式