将代码(方法)注入类? [英] injecting codes (methods) into class?

问题描述

以这个简单的代码为例:

Take this simple code:

class MyClass {
   public $customFunction = array();

   public function run($name){
       call_user_func($this->customFunction[$name]);
   }
}

//> Usage:

$c = new MyClass();
$c->customFunction['first'] = function (){ /* some code*/ };

$c->run('first');

这个成本像 excpted 一样有效.我将该函数添加到 $customFunction 然后我可以从 run(); 方法中调用它.

This cose works as excpted. I add that function to $customFunction and then i can call it form run(); method.

问题出现在我注入的函数中，我尝试做一些与对象相关的事情，例如，如果我添加了这个函数:

The problem comes when in my injected function I try to do something object-related, for example if i add this function:

$c->customFunction['first'] = function(){ $this->callsomemethod(); }

当我调用 run(); 方法时，PHP 说我不能在静态上下文中使用 $this.

When i call the run(); method PHP says I can't use $this in a static context.

我有什么方法可以注入这些函数并能够使用对象方法吗?

Do I have some way to inject those function and be able to use the object method?

(注意:当然我的课只是一个例子，我需要这个作为范围)
谢谢

(Note: of course my class is just an example, I need this for a scope)
Thanks

public function run($name) {
    call_user_func($this->customFunction[$name],$this);
}

此时我只需要添加带有如下参数的函数:

At this point i just need to add function with a parm like this:

= function ($this) { /*some code*/};

并且 $this 将模拟对象上下文范围.

And $this will emulate the object-context scope.

推荐答案

错误源于您在示例中显示为 /* some code*/ 的代码.

The error originates in the code you have shown as /* some code*/ in your example.

您在此处分配匿名函数:

You assign an anonymous function here:

$c->customFunction['first'] = function (){ /* some code*/ };

它仍然只是一个函数.它不会成为类的真正方法.所以在里面使用 $this 是行不通的.

And it remains just a function. It doesn't become a real method of the class. So using $this within it won't work.

解决方法:向您的自定义函数传递一个 $obj 参数，并让它们使用该参数而不是 $this.(真的，只是一个古怪的解决方法；但可行.)

Workaround: Pass your custom functions an $obj parameter, and have them use that instead of $this. (Really, just a quirky workaround; but doable.)

call_user_func($this->customFunction[$name], $obj=$this);

或者尝试 classkit_method_add 或 runkit 以获得正确"的解决方案.- 如果在您的 PHP 中可用.

Or try classkit_method_add or runkit for a "proper" solution. - If available in your PHP.

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