有没有办法重新分配$ this? [英] Is there a way to reassign $this?

问题描述

首先，我不想扩展一个类.我理想上想这样做.

First of all, I do not want to extend a class. I would ideally like to do this.

public function __construct() {
 /* Set Framework Variable */
 global $Five;
 $this =& $Five;
}

我有一个系统，其中变量$ Five是包含其他库的容器类.我可以将其分配给五个本地变量...即

I have a system where the variable $Five is a container class which contains other libraries. I could assign this to a local variable of Five... i.e.

public function __construct() {
 /* Set Framework Variable */
 global $Five;
 $this->Five = $Five;
}

但是，我试图避免这种情况的原因是函数调用会变得有点长.

However, the reason why I am trying to avoid this is that function calls would be getting a little long.

$this->Five->load->library('library_name');

有点难看.会更好.

$this->load->library('library_name');

什么是最好的解决方案?

What is the best solution for this?

推荐答案

我认为

$this->Five->load->library('library_name');

除非您决定让该类扩展帮助程序类，否则

将是您的最佳选择.又名

is going to be your best option unless you decide to have the class extend the helper class. AKA

class Something extends Helper_Class

但是，这意味着每次实例化类时都会实例化Helper_Class.

However, this means that Helper_Class is instantiated every time you instantiate a class.

另一种方法是拥有一个伪静态类，该类将所有帮助程序类分配给类成员

Another method would be to have a pseudo-static class that assigned all of the helper classes to class members

public function setGlobals($five)
{
    $this->loader = $five->loader;
}

然后就叫它

public function __construct($five)
{
    someClass::setGlobals($five);
}

---

如果$Five是全局变量，则每次使用global $Five时都可以，但是将其置于每个函数的顶部似乎是不好的编码.

---

If $Five is a global, you could just global $Five everytime you want to use it, but putting that at the top of every function just seems like bad coding.

此外，我只想在公共服务声明中声明全局变量通常是个坏主意，您可能想搜索依赖注入"或全局变量的替代方法.又名

Also, I'd just like to do my public service announcement that Global variables are generally a bad idea, and you might want to search 'Dependency Injection' or alternative to globals. AKA

public function __construct($five);

代替

global $five;

全局变量依赖于存在并已设置的外部变量，而依赖项注入则请求一个假定它是Five类的实例的变量.

Globals rely on an outside variable to be present and already set, while dependency injection requests a variable that it is assuming to be an instance of the Five class.

如果您正在运行PHP 5.1(感谢Gordon)，则可以通过执行以下操作确保变量是FiveClass的实例:

If you are running PHP 5.1 (Thanks Gordon), you can insure the variable is an instance of the FiveClass by doing this:

public function__construct(FiveClass $five);

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