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<?php class only{ private static $_obj = null; private function __construct(){} //关闭构造函数，禁止直接new private function __clone(){} //关闭克隆函数，禁止克隆 //单例模式实例化方法 public static function getonly(){ if (self::$_obj == null) { $obj = new only(); self::$_obj = $obj; } return self::$_obj; } //测试 function test(){ echo 'hello world'; } } $obj = only::getonly(); $obj->test(); |
