How can PHP be used to display real-time information about online users in a chat application that uses CSV files for data storage?

To display real-time information about online users in a chat application using CSV files for data storage, you can use PHP to read the CSV file, track active users, and update the online status in real-time. One way to achieve this is by periodically polling the CSV file for changes and displaying the updated information to users. 

<?php
// Read the CSV file to get the list of online users
$csvFile = 'users.csv';
$onlineUsers = [];
if (($handle = fopen($csvFile, 'r')) !== false) {
    while (($data = fgetcsv($handle, 1000, ',')) !== false) {
        if ($data[2] == 'online') {
            $onlineUsers[] = $data[0];
        }
    }
    fclose($handle);
}

// Display the list of online users
echo 'Online Users: ' . implode(', ', $onlineUsers);
?>

Keywords

PHP real-time online users chat application CSV files

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