Question

可能重复：
How do I get a PHP class constructor to call its parent's parent's constructor

我知道这听起来很奇怪，但我正试图绕过一个bug。我怎么称呼祖父母方法？

<?php
class Person {
    function speak(){ echo 'person'; }
}
class Child extends Person {
    function speak(){ echo 'child'; }
}
class GrandChild extends Child {
    function speak(){
      //skip parent, in order to call grandparent speak method
    }
}

Answer 1

您可以明确地调用它;

class GrandChild extends Child {
    function speak() {
       Person::speak();
    }
}

parent只是一种使用最近的基类而不在多个地方使用基类名的方法，但是给任何基类的类名也可以使用它而不是直接的父类

Answer 2

PHP以本机方式执行此操作。

试试这个：

class Person {

    function speak(){ 

        echo 'person'; 
    }
}

class Child extends Person {

    function speak(){

        echo 'child';
    }
}

class GrandChild extends Child {

    function speak() {

         // Now here php allow you to call a parents method using this way.
         // This is not a bug. I know it would make you think on a static methid, but 
         // notice that the function speak in the class Person is not a static function.

         Person::speak();

    }
}

$grandchild_object = new GrandChild();

$grandchild_object->speak();

如何跳过执行父方法执行祖父表方法？

2 个答案: