In a PHP script with a login system, what security measures should be implemented to ensure user data privacy when tracking downloads?

When tracking downloads in a PHP script with a login system, it is important to ensure user data privacy by implementing measures such as verifying user authentication before allowing downloads, using secure file storage locations, and logging user activity securely to prevent unauthorized access to sensitive information. 

// Verify user authentication before allowing downloads
session_start();
if(!isset($_SESSION['user_id'])) {
    // Redirect or display an error message
    exit();
}

// Use secure file storage locations
$downloadFilePath = '/path/to/secure/downloads/' . $_GET['file'];
if(!file_exists($downloadFilePath)) {
    // Handle file not found error
    exit();
}

// Log user activity securely
$logMessage = 'User ' . $_SESSION['user_id'] . ' downloaded file ' . $_GET['file'];
file_put_contents('/path/to/secure/logs/log.txt', $logMessage . PHP_EOL, FILE_APPEND);

Keywords

PHP login system security measures user data privacy tracking downloads

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