class A{
<code> public $age = 50;
private $money = 2000;
static public $head = 1;
public function tell(){
echo $this->age,'<br>';
echo self::$head,'<br>';
}
static public function sayMoney(){
echo $this->money,'<br>';
}</code>}
class B extends A{
<code> public $age = 22;
private $money = 10;
public function subtell(){
parent::tell();
echo $this->age,'<br>';
}
public function subMoney()
{
parent::sayMoney();
echo $this->money,'<br>';
}</code>}
$b = new B();
$b->subtell();//22 1 22;
echo '
最后一句话报错Using $this when not in object context
但在调用subMoney()时不就绑定了$this,$this指向b对象，之后执行parent::sayMoney();由于静态调用，所以不绑定$this.在sayMoney（）执行的时候不应该得到2000吗，为什么会报错，和前面$b->subtell();调用有啥不一样
