是否有可能替换PHP类中的函数？ [英] Is it possible to replace a function within a PHP class?

问题描述

这实际上来自一个特定的WordPress问题，但是有一个更为普遍的PHP背后的问题，我很想知道答案。

这个WordPress类有以下几行：

  class Tribe_Image_Widget extends WP_Widget {
 function example_function（）{
 //做一些有用的事情
} 
} 
  

PHP中有什么方法可以从类外部替换 example_function（）吗？

我想这样做的原因是该类来自别人的WP插件（并且在该类中有几个函数），并且我想继续接收插件的更新，但我希望调整其中一个函数。如果我更换插件，那么每次都会丢失所有我自己的更改。所以如果我有我自己的插件，只是改变了这个功能，我就避免了这个问题。

这听起来像你想要的东西要做的是扩展类，并覆盖该特定函数。

 类Your_Tribe_Image_Widget扩展Tribe_Image_Widget 
 {
函数example_function（）{
 //调用基类的功能
 //如果需要的话... 
 parent :: example_function（） ; 
 
 //做其他有用的
} 
} 
  

This is actually comes from a specific WordPress issue but there's a more general PHP point behind it which I'm interested to know the answer to.

The WordPress class is along these lines:

class Tribe_Image_Widget extends WP_Widget {
    function example_function(){
        // do something useful
    }
}

Is there any way in PHP that I can replace example_function() from outside the class?

The reason I want to do this is that the class is from someone else's WP plugin (and has several functions in the class) and I want to continue receiving updates to the plugin but I want one of the functions adapted. If I change the plugin, then I'll lose all my own changes each time. SO if I have my own plugin which just changes that one function, I avoid the problem.

解决方案

It sounds like what you want to do is extend the class, and override that particular function.

Class Your_Tribe_Image_Widget extends Tribe_Image_Widget
{
   function example_function() {
     // Call the base class functionality
     // If necessary...
     parent::example_function();

     // Do something else useful
   }
}

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