更多关于PHP OOP - 类中的类 [英] More About PHP OOP - Classes within Classes

问题描述

我被告知一个类不能在PHP中的类中定义。但是，在我自己的例子中，这似乎工作，我困惑：

class_test.php：

  require（'class_1.php'）; 
 new class_1 
 //这里需要$ missing_variable。 
  

class_1.php

  class class_1 {
 public function function_1（）{
 function callback_function（）{
 echoA Callback; 
 $ missing_variable =我去哪儿？ 
} 
 require（'class_2.php'）; 
 new class_2（'callback_function'）; 
} 
 public function __construct（）{
 $ this-> function_1（）; 
} 
} 
  

class_2.php / p>

  class class_2 {
 public function __construct（$ callback）{
 echoHello World  - ; 
 call_user_func（$ callback）; 
} 
} 
  

加载class_test.php打印

  Hello World  - 回调
  

问题：如何定义 $ missing_variable ，以便我可以在需要的地方获取？ / p>

---

如果将来有任何人有类似的问题，尽管这不太可能，我想链接到下面显示了来自类外部的$ missing_variable echo'd：

http://codepad.org/tRk0XWG7

再次感谢所有人。

---

^{注意：这是}

您将返回 $ missing_variable 在几个地方。见下文。 （这不是唯一的方法，介意你）

http://codepad.org/tf08Vgdx

 < ;? 
 class class_2 {
 public function __construct（$ callback）{
 echoHello World  - ; 
 $ missing = $回调（）; 
 $ this-> missing = $ missing; 
} 
} 
 class class_1 {
 public function function_1（）{
 function callback_function（）{
 echoA Callback。 
 $ missing_variable =我去哪儿？ 
 return $ missing_variable; 
} 
 $ class2 = new class_2（'callback_function'）; 
 return $ class2-> missing; 
} 
 public function __construct（）{
 $ this-> missing = $ this-> function_1（）; 
} 
} 
 
 $ class = new class_1（）; 
 
 echo $ class-> missing; 
  

I have been told that a class cannot be defined within a class in PHP. However, in my own example this seems to work which has me confused:

class_test.php:

require('class_1.php');
new class_1
//Need $missing_variable here.

class_1.php

class class_1{
    public function function_1(){
        function callback_function(){
            echo "A Callback";
            $missing_variable = "Where Did I Go?";
        }
        require('class_2.php');
        new class_2('callback_function');
    }
    public function __construct(){
        $this->function_1();
    }
}

class_2.php

class class_2{
    public function __construct($callback){
        echo "Hello World - ";
        call_user_func($callback);
    }
}

Loading class_test.php prints out

Hello World - A Callback

Question: How do I define $missing_variable such that I can get it where I need it?

---

In case anyone in the future has a similar problem, however unlikely that may be, I want to link to the codepad from below that shows the $missing_variable echo'd from outside the classes:

http://codepad.org/tRk0XWG7

Thanks again everyone.

---

^{Note: This is a follow up.}

解决方案

You would return $missing_variable in a few places. See below. (This isn't the only way to do it, mind you)

http://codepad.org/tf08Vgdx

<?
class class_2{
    public function __construct($callback){
        echo "Hello World - ";
        $missing = $callback();
        $this->missing = $missing;
    }
}
class class_1{
    public function function_1(){
        function callback_function(){
            echo "A Callback. ";
            $missing_variable = "Where Did I Go?";
            return $missing_variable;
        }
        $class2 = new class_2('callback_function');
        return $class2->missing;
    }
    public function __construct(){
        $this->missing = $this->function_1();
    }
}

$class = new class_1();

echo $class->missing;

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