What is PHP Session and how to open it

This article mainly explains "what is PHP Session and how to open it". Friends who are interested might as well take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what PHP Session is and how to open it.

The PHP session variable is used to store information about the user session (session) or to change the settings of the user session (session). The Session variable stores information for a single user and is available to all pages in the application.

PHP Session variable

When you operate an application on your computer, you open it, make some changes, and then close it. It's a lot like a Session. The computer knows who you are. It knows when you open and close the application. However, there is a problem on the Internet: because the HTTP address cannot be maintained, the Web server does not know who you are and what you have done.

PHP session solves this problem by storing user information on the server for later use (such as user name, purchase, etc.). However, the session information is temporary and will be deleted after the user leaves the site. If you need to store information permanently, you can store the data in a database.

Session works by creating a unique id (UID) for each visitor and storing variables based on that UID. UID is stored in cookie or transmitted through URL.

Turn on PHP Session

Before you can store user information in PHP session, you must first start the session.

Note: the session_start () function must precede the label:

Example

The above code registers the user's session with the server so that you can start saving user information and assigns a UID to the user session.

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