Codeigniter：获取实例 [英] Codeigniter: Get Instance

问题描述

Codeigniter中的获取实例的目的是什么？

What is the purpose of "Get Instance" in Codeigniter? How would you explain this to a total beginner?

推荐答案

确定，所以CodeIgniter中的一切都通过超级用户magic $ this 变量。这只适用于类，因为 $ this 基本上定义了当前类。

Ok, so everything in CodeIgniter runs through the super-magic $this variable. This only works for classes, as $this basically defines the current class.

$ this is there，allow you to do $ this-> load-> model（'whatever'）;

Your controller is a class, so $this is there, allowing you to do $this->load->model('whatever');

在模型中，你也在使用一个类。这里略有不同，因为 $ this 只包含有用的东西，因为你从模型中扩展。仍然， $ this 仍然有效。

In models, you are also using a class. It is slightly different here, as $this only contains useful stuff as you are extending from Model. Still, $this is still valid.

当您使用助手或库时， 实例或 $ this 等效。

When you are using a helper or a library, you need to find that "instance" or $this equivalent.

$ci =& get_instance();

...使 $ ci 即使你不在一个类中，也不在继承它的类中。

…makes $ci contain the exact same stuff/code/usefulness as $this, even though you are not in a class, or not in a class that inherits it.

这是对2个品脱后的初学者的解释，所以它是错误或关于正确。 ; - ）

That's an explanation for total beginners after 2 pints, so it's either wrong or about right. ;-)

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