How can PHP developers ensure session variables are maintained for users with varying cookie settings?

When dealing with users who have varying cookie settings, PHP developers can ensure session variables are maintained by using URL-based sessions. This involves appending the session ID to URLs so that users without cookies enabled can still access session data. By including the session ID in URLs, developers can ensure that session variables are maintained regardless of the user's cookie settings. 

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

// Check if a session ID is present in the URL
if(isset($_GET['PHPSESSID'])) {
    session_id($_GET['PHPSESSID']);
}

// Set session variables
$_SESSION['user_id'] = 123;

// Append session ID to URLs
echo '<a href="page.php?PHPSESSID='.session_id().'">Link</a>';
?>

Keywords

PHP session variables cookie settings session_start() ini_set()

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