$car->name = '奥迪A6'; echo $car->getName(); Car::echoColor(); var_dump($car); unset($car); //继承 class Truck extends Car { public function rename() { //调用父类成员 $this->name = parent::getName() . '2'; } } $truck = new Truck(); $truck->rename(); echo $truck->getName(); //对象的成员可以动态添加,修改,删除 $truck->long = 3; echo $truck->long; //读取cookie var_dump($_COOKIE['TestCookie']); //设置cookie,指定字段名,值,有效期,有效路径,域 setcookie("TestCookie", 1, time() + 3600, "/"); //删除cookie setcookie('test', '', time() - 1); //开启session session_start(); //设置session字段 $_SESSION["time"] = time(); //删除session字段