PHP多态代码实例
这篇文章主要介绍了PHP多态代码实例,本文用2个代码实例来演示PHP中的多态,需要的朋友可以参考下
多态定义:只关心一个接口或者基类,而不关心一个对象的具体类。(同一类型,不同结果)
这里两个例子:
第一个,我们发现,基类定义了标准,子类进行了自我规则的实现。这是多态的一个要求。同时,这是满足重写;实际上这是不同类的不同表现;没有严格满足一个接口,或者基类编程。因为你调用的时候不是 stu->showGrade() 而是各自自己的方法;
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class stu{
public function showGrade(){ echo "base class"; }
}
class xiaomin extends stu{
public function showGrade(){ echo "is son show 80"; } }
class xiaoli extends stu{
public function showGrade(){ echo "is son show 60"; } }
function doit($obj){
if(get_class($obj) != "stu"){ $obj->showGrade(); }
}
doit(new xiaoli()); doit(new xiaomin()); |
第二个例子:dovoice 参数规定了$obj 为animal,意识就是用接口 接受了 实现类对象。了向上转型。这就符合同一类型,不同结果了,这就是多态;
实际上在Java中 会是 animal a = new dog();这样子的;因为PHP 是若类型语言。没有对象转型机制。
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interface animal{ public function voice(); }
class cat implements animal{ public function voice(){ echo "miao~~~ } }
class dog implements animal{ public function voice(){ echo "wang ~~~ } }
function dovoice(animal $obj){ $obj->voice(); }
dovoice(new dog()); dovoice(new cat()); |

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