PHP session is a way to store data in variables that can be accessed on all webpages.

Follow the steps below to create and use a session in PHP:

1. Start the Session

To start a session, we use session_start() at the top of our file. This makes the session available for storing and retrieving data.

<?php

session_start(); // Start the session

<?php session_start(); // Start the session ?>

<?php
session_start();  // Start the session
?>

2. Store Data in the Session

Now we store data in the session. To store data in session, we use $_Session array.

For example, to store a username in a session

<?php

session_start();

$_SESSION['username'] = 'Karan';

<?php session_start(); $_SESSION['username'] = 'Karan'; ?>

<?php
session_start();  
$_SESSION['username'] = 'Karan';
?>

3. Get Data from the Session

Now, to get the username from the session, we use $_SESSION with the key, which is the username.

<?php

session_start();

// Get and show the stored username

echo 'User name is ' . $_SESSION['username']; // Output: User name is , Karan

<?php session_start(); // Get and show the stored username echo 'User name is ' . $_SESSION['username']; // Output: User name is , Karan ?>

<?php
session_start(); 
// Get and show the stored username
echo 'User name is  ' . $_SESSION['username'];  // Output: User name is , Karan
 ?>

4. Update session data

Now, to update session data, we simply pass a new value to the session variable; it will remove the old value and save the new value in the session variable. Now we update the username to Mohit.

<?php

session_start();

// Change the username

$_SESSION['username'] = 'Mohit';

<?php session_start(); // Change the username $_SESSION['username'] = 'Mohit'; ?>

<?php
session_start();  
// Change the username
$_SESSION['username'] = 'Mohit';
?>

5. Remove or Destroy Session Data

To remove data from a session, we use unset(), which will remove the session variable, and to destroy the session, we use session_destroy().

Remove a Session Variable:

<?php

session_start();

// Remove the username from the session

unset($_SESSION['username']);

<?php session_start(); // Remove the username from the session unset($_SESSION['username']); ?>

<?php
session_start();  
// Remove the username from the session
unset($_SESSION['username']);
?>

Destroy the entire session completely

<?php

session_start();

// Remove all session variables

session_unset();

// Destroy the session

session_destroy();

<?php session_start(); // Remove all session variables session_unset(); // Destroy the session session_destroy(); ?>

<?php
session_start();  
// Remove all session variables
session_unset();
// Destroy the session
session_destroy();
?>

Summary

PHP allows you to store data on the server that can be accessed across multiple pages on a website. This is useful for things like user logins, shopping carts, and saving preferences. By using session_start(), you can store, retrieve, and manage data easily throughout a user’s visit to your site.

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