How can JavaScript be utilized to update user lists in a PHP chat application without relying on persistent MySQL connections?

To update user lists in a PHP chat application without relying on persistent MySQL connections, you can use AJAX requests in JavaScript to periodically fetch updated user lists from the server. This way, the client-side JavaScript can handle updating the user interface with the latest user information without the need for a persistent MySQL connection. 

// PHP code snippet to fetch updated user lists
if ($_SERVER['REQUEST_METHOD'] === 'GET' && isset($_GET['action']) && $_GET['action'] === 'getUsers') {
    // Fetch updated user lists from the database
    $users = getUsersFromDatabase();

    // Return the updated user lists as JSON response
    header('Content-Type: application/json');
    echo json_encode($users);
    exit;
}

// Function to fetch users from the database
function getUsersFromDatabase() {
    // Implement your logic to fetch users from the database
    // For example:
    $users = ['user1', 'user2', 'user3'];
    return $users;
}

Keywords

JavaScript PHP chat application user lists MySQL connections

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