What are the potential pitfalls of deleting user entries after a certain period of inactivity in PHP?

Potential pitfalls of deleting user entries after a certain period of inactivity in PHP include accidentally deleting important data, causing user frustration, and potential legal issues if the data deletion violates privacy laws. To mitigate these risks, it is important to have a clear data retention policy in place, notify users before their data is deleted, and provide an option for users to request an extension or retrieve their data before deletion.

// Check if user has been inactive for a certain period of time before deleting their entry
$inactivePeriod = 30; // 30 days of inactivity
$lastActivity = strtotime($user['last_activity']);
$currentDate = time();

if (($currentDate - $lastActivity) >= ($inactivePeriod * 24 * 60 * 60)) {
    // Delete user entry
    $query = "DELETE FROM users WHERE id = ?";
    $stmt = $pdo->prepare($query);
    $stmt->execute([$user['id']]);
    echo "User entry deleted due to inactivity.";
} else {
    echo "User is still active.";
}