php的单例模式简单例子

1 class Person2 {3     private function __construct(){}  //构造方法4     private function __clone(){}  //克隆方法5 }

 1 class Person 2 { 3     private static $instance; 4     private function __construct(){} 5     private function __clone(){} 6  7     public static function getInstance(){ 8         if (!is_object(self::$instance)) { 9             self::$instance = new self;10         }11         return self::$instance;12     }13 }

1 $i1 = Person::getInstance();2 echo "i1：";3 var_dump($i1);4 echo "<hr/>";5 echo "i2：";6 $i2 = Person::getInstance();7 var_dump($i2);