Are there best practices for optimizing PHP scripts that display online users?

When displaying online users in PHP scripts, it is important to optimize the code to ensure efficient performance. One way to achieve this is by using caching mechanisms to reduce the number of database queries and minimize server load. Additionally, implementing proper indexing on the database tables storing user information can also improve the speed of retrieving online user data. 

// Example code snippet for optimizing PHP scripts that display online users

// Check if the online users data is already cached
$onlineUsers = apc_fetch('online_users');

// If not cached, retrieve the online users data from the database
if(!$onlineUsers) {
    $onlineUsers = $db->query('SELECT * FROM users WHERE online = 1')->fetchAll(PDO::FETCH_ASSOC);

    // Cache the online users data for future use
    apc_store('online_users', $onlineUsers, 60); // Cache for 60 seconds
}

// Display the online users
foreach($onlineUsers as $user) {
    echo $user['username'] . '<br>';
}

Keywords

PHP optimization online users performance caching

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