我们经常听到面向对象的三大特性:封装、继承、多态，但是还有许多特性，那么我们是否记得重写呢？在学习的时候简单的记录了下php中等重写方法：
1）先通过例子看下，这样更加明了
//定义父类（也可以称为基类）
class Goods {
public $goods_name = 'Goods:name';
public function sayName() {
echo $this->goods_name;
}
}
//定义子类（也可以成为扩展类）
class Book extends Goods {
public $goods_name='Book:name';
public function sayName() {
echo 'run in book';
}
}
//实例化对象
$b1 = new Book;
//输出run in book，因为子类重写了父类的sayName()方法
$b1->sayName();
下章总结下php中的重写调用...
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