Let's talk about the empty controller of ThinkPHP6

The empty controller only occupies a very small space in the ThinkPHP6 manual. So what is an empty controller? Even this word may not be heard or used by many programmers. So this time Let me use a practical example to talk about the empty controller of ThinkPHP6.

We search for the "empty controller" keyword in the official manual of ThinkPHP6, and we can find the chapter content of the empty controller. Let’s take a look at the official definition of an empty controller first:

The concept of an empty controller means that when the system cannot find the specified controller name, the system will try to locate the current application Empty controller (Error) class, using this mechanism we can use to customize error pages and optimize URLs.

In other words, we can use an empty controller to customize our error page.

The manual uses a single application as an example, but in reality most of our projects have multiple applications, so next we use multiple applications as an example.

Assume that our project domain name is www.xiangmu.com. We have two applications, index and demo. Each application has its own index controller and index method.

1. No method found.

If we randomly enter www.xiangmu.com/index/index/a in the browser, this address will access the a method in the index controller under the index application, but our a method does not Doesn't exist. What if this invalid request can be rejected? Then our empty controller in this section will appear.

We add the following method to the index control:

public function __call($method, $args){
    return 'error request!';
}

As long as you access methods that cannot be found in the index control, you will go to __call. So now that we have reached __call(), for the page that does not exist, can we make a 404.html and use call() to render the template.

2. The controller cannot be found.

The above method cannot be found. What should I do if the controller cannot be found? I randomly enter the controller in the browser, www.xiangmu.com/index/a/a. In fact, we do not have a controller or a method. What if we can reject this invalid request?

Then use the Error.php controller below to solve the problem. Add that the current access is the index application, so we put Error.php under the index application. In the same way, we can also set up error pages such as 404.

<?php
namespace app\index\controller;

use app\BaseController;

class Error extends BaseController
{
    public function __call($method, $args){
            return &#39;error request!&#39;;
    }
}

The above is the relevant explanation about the empty controller, go and try it quickly!

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