在PHP中看来多态真的是多态吗? [英] Is what seems like polymorphism in PHP really polymorphism?
问题描述
试图弄清楚PHP是否支持方法重载,继承和多态性等功能,我发现:
Trying to figure out whether PHP supports features like method overloading, inheritance, and polymorphism, I found out:
- 它不支持方法重载
- 它确实支持继承
但是我不确定多态性.我在Google上搜索了以下内容:
but I am unsure about polymorphism. I found this Googling the Internet:
我应该注意,在PHP中 多态并不完全是这样 应该.我的意思是它确实有效, 但由于我们的数据类型较弱,因此 不正确.
I should note that in PHP the polymorphism isn't quite the way it should be. I mean that it does work, but since we have a weak datatype, its not correct.
那真的是多态吗?
修改
只是不能在PHP supports polymorphism
旁边放置确定的YES或NO.我不愿声明:"PHP不支持多态",但实际上却支持.反之亦然.
Edit
Just can't quite place a definite YES or NO next to PHP supports polymorphism
. I would be loath to state: "PHP does not support polymorphism", when in reality it does. Or vice-versa.
推荐答案
class Animal {
var $name;
function __construct($name) {
$this->name = $name;
}
}
class Dog extends Animal {
function speak() {
return "Woof, woof!";
}
}
class Cat extends Animal {
function speak() {
return "Meow...";
}
}
$animals = array(new Dog('Skip'), new Cat('Snowball'));
foreach($animals as $animal) {
print $animal->name . " says: " . $animal->speak() . '<br>';
}
您可以随意标记它,但是对我来说,这看起来像是多态性.
You can label it all you want, but that looks like polymorphism to me.
这篇关于在PHP中看来多态真的是多态吗?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!