What potential issues can arise when trying to pass sessions through links in PHP?

When passing sessions through links in PHP, potential issues can arise due to the session ID being exposed in the URL, making it vulnerable to session hijacking. To solve this issue, you can use session_regenerate_id() to generate a new session ID after passing the session through a link. 

<?php
session_start();

// Check if session ID is already set
if (!isset($_SESSION['session_id'])) {
    $_SESSION['session_id'] = session_id();
}

// Regenerate session ID
session_regenerate_id();

// Pass session ID through link
echo '<a href="page.php?sid=' . urlencode($_SESSION['session_id']) . '">Click here</a>';
?>

Keywords

session link passing security serialization

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