为什么会报错？
class Car {
public $speed = 0;
//增加speedUp方法，使speed加10
public static function speedUp(){
$this->speed+=10;
}
}
$car = new Car();
Car::speedUp();
echo $car->speed;
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class Car {
public $speed = 0;
//增加speedUp方法，使speed加10
public static function speedUp(){
$this->speed+=10;
}
}
$car = new Car();
Car::speedUp();
echo $car->speed;
2017-11-25
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