What potential issues can arise when trying to store multiple user IDs in sessions in PHP?

Storing multiple user IDs in sessions can lead to confusion and potential security risks, as it may be difficult to accurately track which user is currently logged in. To solve this, consider using an array to store user IDs in the session, with each ID associated with a unique key. This way, you can easily retrieve the correct user ID based on the key. 

// Storing multiple user IDs in sessions using an array
session_start();

// Add user IDs to the session array
$_SESSION['user_ids'] = [
    'user1' => 123,
    'user2' => 456,
    // Add more user IDs as needed
];

// Retrieve user ID using the key
$user1_id = $_SESSION['user_ids']['user1'];
$user2_id = $_SESSION['user_ids']['user2'];

Keywords

session user IDs storage security serialization

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