How can PHP sessions be used to store and maintain data across multiple form submissions and page navigations?
PHP sessions can be used to store and maintain data across multiple form submissions and page navigations by storing the data in the $_SESSION superglobal array. This array persists across different pages as long as the session is active, allowing you to access the stored data whenever needed.
<?php
// Start the session
session_start();
// Store data in the session
$_SESSION['username'] = 'JohnDoe';
// Access the stored data
echo $_SESSION['username'];
?>