<strong style="background-color:rgb(255,255,255)">class Car {    private $ary = array();        public function __set($key, $val) {        $this->ary[$key] = $val;    }        public function __get($key) {        if (isset($this->ary[$key])) {            return $this->ary[$key];        }        return null;    }        public function __isset($key) {        if (isset($this->ary[$key])) {            return true;        }        return false;    }        public function __unset($key) {        unset($this->ary[$key]);    }}$car = new Car();$car->name = '汽車';  //name屬性動態(tài)創(chuàng)建并賦&#20540;echo $car->name;</strong>

<strong style="background-color:rgb(255,255,255)">class Car {    public $speed = 0;        public function __call($name, $args) {        if ($name == 'speedUp') {            $this->speed &#43;= 10;        }    }}$car = new Car();$car->speedUp(); //調(diào)用不存在的方法會使用重載echo $car->speed;</strong>