How To Keep User Login Session In Php

In this blog post, we will discuss how to keep user login sessions in PHP to improve the user experience on your website. By maintaining a user session, a website can remember a user after they have logged in, and allow them to access the protected content without having to re-enter their credentials. This functionality is essential for any web application that requires authentication, such as an online store or a membership site.

What is a PHP Session?

A PHP session is a mechanism that allows you to store data on the server that is associated with a specific user. When a user logs in, the server assigns them a unique session ID, which is then stored in a cookie on the user’s browser. This session ID is sent back to the server with each subsequent request, allowing the server to identify the user and access their session data.

Steps to Keep User Login Session in PHP

1. Start a PHP Session

To start a PHP session, you need to call the session_start() function at the beginning of your script. It is crucial to place this function before any HTML output or headers are sent to the browser.

2. Store User Information in the Session

Once a user has successfully logged in, you should store their information in the session. Typically, this would involve saving the user’s ID and other relevant data in the $_SESSION superglobal array. For example:

3. Check for an Active Session on Protected Pages

On pages that require authentication, you should check if a user’s session is active before granting them access. To do this, verify if the necessary session variables are set, such as the user ID. If the session is active, you can display the protected content. If not, redirect the user to the login page.

4. Implement a Logout Functionality

To allow users to log out and end their session, create a logout script that clears the user’s session data and destroys the session. This can be done using the session_unset() and session_destroy() functions.


By following these steps, you can easily implement a user login session in PHP to provide a secure and user-friendly authentication system for your web application. Remember to always use HTTPS to encrypt the communication between the server and the client, and to store user passwords securely using hashing techniques like bcrypt.