在另一个文件中扩展类的正确方法是什么? [英] What is the proper way to extend a class in another file?

问题描述

这就是我在foo.php中拥有的

This is what I have in foo.php

class Foo
{
    public $foo = NULL;
    public $foo2 = NULL;

    public function setFoo ($foo, $foo2)
    {
       $this->foo = $foo;
       $this->foo2 = $foo2'
    }
}

这是我在foo3.php中拥有的

This is what I have in foo3.php

class Foo3 extends Foo
{
    public $foo3 = NULL;

    public function setFoo3 ($foo3)
    {
       $this->foo = $foo3;
    }
}  

这就是我在第三个文件run.php中要求它的方式:

This is how I require it in my third file run.php:

require_once "foo.php";
require_once "foo3.php";
$foo = new Foo();
$foo->setFoo3("hello");

我收到此错误:

致命错误:调用未定义的方法Foo :: setFoo3()

Fatal error: Call to undefined method Foo::setFoo3()

我不确定问题是否出在我对它们的需求方式上.谢谢.

I'm not sure if the problem is how I'm requiring them. Thanks.

推荐答案

在您的示例中，您将实例化Foo，它是父级，并且不知道方法setFoo3().试试这个:

In your example, you are instantiating Foo, which is the parent and has no knowledge of the method setFoo3(). Try this:

class Foo3 extends Foo
{
    ...
}

require_once "foo.php";
require_once "foo3.php";
$foo = new Foo3();
$foo->setFoo3("hello");

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