How can PHP developers achieve the desired format for session variables, as described in the forum thread?

The desired format for session variables, as described in the forum thread, can be achieved by using PHP's `$_SESSION` superglobal array to store the variables in the desired format. To do this, PHP developers can set the session variables individually with the desired keys and values.

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

// Set session variables in the desired format
$_SESSION['key1'] = 'value1';
$_SESSION['key2'] = 'value2';
$_SESSION['key3'] = 'value3';
?>