How to use thinkphp5 to clear session (A brief analysis of the method)

With the continuous development of web development, many websites use session technology. Session technology can save user data on the server side and provide users with personalized services. However, in some cases, we need to clear the session. This article will describe in detail how to use thinkphp5 to clear the session.

1. The basic concept of session

What is session? Simply put, session is a server-side storage technology that can save user data on the server side. Session works as follows:

1. When a user visits a website for the first time, the server automatically assigns a unique session_id to the user and saves the session_id in the user's browser.
2. When the user performs other operations, the server will find the corresponding session based on the session_id in the browser, and then read or modify the data saved in the session.
3. When the user closes the browser, the server will destroy the user's session and the corresponding session file will also be deleted.

2. Method of clearing session

In some cases, we need to clear session, such as user logging out, switching users, etc. So, how to clear the session? Three commonly used methods are introduced below:

1. Use the destroy method of the Session class

thinkphp5 provides a Session class that can easily operate the session. Use the destroy method of this class to clear the specified session.

The sample code is as follows:

use think\facade\Session;

// 清除名为 user_info 的 session
Session::destroy('user_info');

2. Use the clear method of the Session class

Use this method to clear all sessions.

The sample code is as follows:

use think\facade\Session;

//清除所有session
Session::clear();

3. Delete the session file directly

By default, thinkphp5 will save the session file in the runtime/session directory . We can directly delete the specified session file in this directory to clear the session.

The sample code is as follows:

unlink('./runtime/session/sess_session_id');

Among them, session_id refers to the id of the session that needs to be deleted.

3. Summary

This article describes in detail how to use thinkphp5 to clear the session, including using the destroy method and clear method of the Session class, and directly deleting the session file. At the same time, we also introduced the basic concept of session. I believe that after studying this article, readers can master the method of clearing sessions and apply it to actual development.

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