PHP method to view the ID of the current Session-PHP Tutorial-php.cn

PHP method to view the ID of the current Session

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Release： 2023-03-13 16:46:01

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PHP session Variables are used to store information about the user session, or to change the settings of the user session. The information held by the Session variable is single-user and available to all pages in the application.

PHP Session Variables

When you run an application, you open it, make changes, and then close it. It's a lot like a session. The computer knows who you are. It knows when you start the application and when it terminates it. But on the Internet, there's a problem: the server doesn't know who you are and what you do, and that's because HTTP addresses don't maintain state.

PHP session solves this problem by storing user information on the server for subsequent use (such as user name, purchased items, etc.). However, 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.

The working mechanism of Session is to create a unique id (UID) for each visitor and store variables based on this UID. The UID is stored in a cookie or transmitted through the URL.

This article mainly introduces the method of php to view the ID of the current Session. It analyzes two common techniques for obtaining the ID in the session, which is very practical. Value, friends in need can refer to it

There are two ways to get the user's session id. The first is to use the session_id()function, and the other is to use the built-in ConstantSID is obtained. SID contains session id and session value

<?php
 session_start();
 print("<html><b>");
 $sid = session_id();
 print("Session ID returned by session_id(): ".$sid."\n");
 $sid = SID;
 print("Session ID returned by SID: ".$sid."\n");
 $mysite = $_SESSION["mysite"];
 print("Value of mysite has been retrieved: ".$mysite."\n");
 print("</b></html>\n");
?>

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