我試的沒錯，你再試試

<?php
class?Car?{
????private?$speed?=?0;
????
????public?function?getSpeed()?{
????????return?$this->speed;
????}
????
????protected?function?speedUp()?{
????????$this->speed?+=?10;
????}
????
????//增加start方法，使他能夠調(diào)用受保護的方法speedUp實現(xiàn)加速10
????public?function?start(){
????????$this->speedUp();
????}


}
$car?=?new?Car();
$car->start();
echo?$car->getSpeed();

一般這種情況都是分號！