What are some potential pitfalls when working with sessions in PHP, as seen in the forum thread?

One potential pitfall when working with sessions in PHP is not starting the session before trying to access or modify session variables. To solve this issue, make sure to call session_start() at the beginning of your PHP script before interacting with session variables. 

<?php
session_start();

// Accessing session variables
$_SESSION['username'] = 'example_user';

// Modifying session variables
$_SESSION['counter'] = ($_SESSION['counter'] ?? 0) + 1;
?>

Keywords

session_start session hijacking session fixation session_regenerate_id session variables

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