How to use the prefix method in thinkphp5

1. Concept

Pre-method refers to performing some other methods or operations before executing a method. It is usually used for permission authentication, Aspects such as data validation and logging. Compared with post-methods, pre-methods are executed earlier in order, and preprocessing and data preparation can be performed before executing the main method.

2. Features

1. Execution order: The pre-method defined in the controller will be executed before other methods in the controller are executed.

2. Inheritance: Pre-methods can be inherited into subclasses, which improves the degree of code reuse.

3. Multiple front-end methods can be set to meet the needs of different scenarios.

3. How to use

In thinkphp5, using the prefix method is very simple. We only need to define one or more methods ending with _before in the controller class. These methods will be executed before other controller methods are executed. For example:

class Blog extends Controller {

    // 定义前置方法
    protected function _before() {
        // 实现权限认证、数据过滤等预处理工作
    }

    // 定义其他方法
    public function index() {
        // 具体的业务逻辑
    }
}

When we access the index method, the _before method will be automatically executed. In this way, we can implement various types of front-end methods, such as permission authentication, data verification, logging, etc.

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