__call捕获静态方法调用 [英] __call catches static method calls

问题描述

我同时使用了两种魔术方法 _ call 和 _callStatic 用于我自己的ORM/Activerow之类的实现.它们主要用于捕获某些函数调用:__call负责getter和setter，而__callStatic负责findBy方法(例如findById).

I'm using both the magic methods _call and _callStatic for my own implementation of something like an ORM/Activerow. They're mainly meant for catching certain function calls: __call is responsible for getters and setters, and __callStatic for findBy methods (e.g. findById).

要映射外键，我正在尝试将呼叫转换为getArticle返回Article::findById()的值.为此，我在__call中使用这种情况:

To map foreign keys, i'm trying to convert calls to e.g. getArticle to return the value of Article::findById(). To do that, i'm using this case inside my __call:

if (strstr($property, "_id")) {  
 return $foreignClass::findById($this->getId()); 
}

其中，$property是__call中 set 或 get 之后的子字符串，而$foreignClass是字符串的其余部分.因此，在调用getArticle的情况下，将获得$ property，而$foreignClass将是Article.

where $property is the substring after set or get in __call, and $foreignClass the rest of the string. So, in the case of the call getArticle, $property would be get and $foreignClass would be Article.

我放置了一些回声以确保值正确.但是，我的__call方法而不是我的__callStatic被调用.如果我做一个隐式静态方法findById，它会被调用(因此它会将它识别为静态调用).如果我专门呼叫Article::findById()，__call也将其捕获.

I've placed some echoes to ensure that the values are correct. However, my __call method gets called instead of my __callStatic. If i make an implicit static method findById, it does get called (so it does recognize it as a static call). If i specifically call Article::findById(), __call also catches it.

相对较新的__callStatic是一个错误，还是我做错了什么?

Is this an error with the relatively new __callStatic, or am i doing something wrong?

问题似乎出在这部分:

The problem seems to reside in this part:

在对象上下文中调用不可访问的方法时，会触发

_call().
在静态上下文中调用不可访问的方法时，会触发__callStatic().

_call() is triggered when invoking inaccessible methods in an object context.
__callStatic() is triggered when invoking inaccessible methods in a static context.

尽管我在类上调用它，但是我从对象上下文调用它.在这种情况下，有没有办法进入静态上下文?

Though i am calling it on a class, i am calling it from an object context. Is there a way to get into the static context in this case?

推荐答案

由于您提供的代码是在Activity对象的上下文中运行的，并且由于$foreignClas的值是Article，因此是Article的祖先Activity，PHP假定您打算调用祖先的实现该方法.

Since the code you give runs in the context of an Activity object and since the value of $foreignClas is Article, which is an ancestor of Activity, PHP assumes that you are intending to call an ancestor's implementation of the method.

要突破对象上下文，除了这种绝对可怕的技术外，没有其他选择:

To break out of the object context there is AFAIK no option other than this absolutely hideous technique:

$id = $this->getById();
return call_user_func(
    function() use($foreignClass, $id) { 
        return call_user_func("$foreignClass::findById", $id);
    }
);

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