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php中重写理解

WBOY
Release: 2016-06-21 08:47:28
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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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