How can sessions be effectively used to pass variables between pages in PHP?
Sessions can be effectively used to pass variables between pages in PHP by storing the variables in the $_SESSION superglobal array. This allows the variables to persist across multiple page loads for a specific user session. To use sessions, you need to start the session at the beginning of each PHP file where you want to access the stored variables.
<?php
// Start the session
session_start();
// Set a session variable
$_SESSION['username'] = 'john_doe';
// Access the session variable on another page
echo $_SESSION['username'];
?>