关于类的问题，程序执行错误，高人给分析一下

Question

$vehicle=new Vehicle; 
$vechicle->accelerate(45);//========> $vehicle->accelerate(45);

Answer 1

<?phpclass Vehicle
{
var $speed; function accelerate($num)
{
if($this->speed + $num < 150)
{
$this->speed += $num;
echo $this->speed;
}
else
{
$this->speed = 150;
}
} function decelerate($num)
{
if($this->speed > $num)
$this->speed -= $num;
else
return 0;
}
}$vehicle = new Vehicle();
$vehicle->accelerate(45);
//^^^^^^^ 指针名不正确(不知道PHP里是不是叫指针)  ：（
?>