How can I use session variables in PHP to store and update arrays across multiple page requests?

Arrays as Session Variables in PHP

Storing arrays as session variables in PHP allows for the persistence of data across multiple page requests. This is achieved through PHP's native session management system.

Creating an Array Session Variable

<code class="php"><?php
session_start();

$_SESSION['names'] = ['Alice', 'Bob', 'Carol'];
?></code>

Accessing the Array Session Variable

On subsequent page requests, you can access the session array using:

<code class="php"><?php
session_start();

$names = $_SESSION['names'];</code>

Updating or Unsetting the Array Session Variable

To update or unset the session variable, simply assign a new value or use the unset() function:

<code class="php"><?php
session_start();

// Update the array
$_SESSION['names'][] = 'Dave';

// Unset the array
unset($_SESSION['names']);</code>

Your Scenario

In your scenario, the session array will contain the latest list of names selected on the second page (page 2). When you return to the first page and click a different cell, the session array will maintain the updated list, provided no changes were made on the third page (page 3). This is because the session variable persists until you explicitly change or unset it.

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