在PHP中看来多态真的是多态吗?

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:

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.

EditJust 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.

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