不知道错在哪里了
class Car {
public $speed = 0;
public function speedUp() {
$this->speed += 10;
}
}
$car = new Car();
$car->speedUp();
echo $car->speed;上面是源代码，下面是自己在最后两行做的改动，不知道错在哪里
class Car {
public $speed = 0;
public function speedUp() {
$this->speed += 10;
}
}
$car = new Car();
echo $car->speedup();
