php
class UserIpHandler {
    private $headers;
    private $pdo;

    public function __construct(array $headers, PDO $pdo) {
        $this->headers = $headers;
        $this->pdo = $pdo;
    }

    public function getUserIp(): string {
        foreach ($this->headers as $header) {
            if (isset($_SERVER[$header])) {
                $ipList = explode(',', $_SERVER[$header]);
                return trim(end($ipList));
            }
        }

        return '';
    }

    public function getUserDataByIp(string $ip): ?array {
        try {
            $userData = $this->executeDatabaseQuery("SELECT * FROM users WHERE ip_address = :userIp", ['userIp' => $ip]);
            return $userData;
        } catch (PDOException $e) {
            // Log the error or handle it as needed
            error_log("Database Error: " . $e->getMessage());
            return null;
        }
    }

    public function processUserData(array $userData): string {
        if ($userData) {
            $processedData = $this->advancedProcessing($userData);
            return "Processed user data: " . $processedData;
        } else {
            return "User data not found or an error occurred.";
        }
    }

    private function executeDatabaseQuery(string $query, array $params = []): ?array {
        $stmt = $this->pdo->prepare($query);

        foreach ($params as $param => $value) {
            $stmt->bindParam(":$param", $value);
        }

        $stmt->execute();
        return $stmt->fetch(PDO::FETCH_ASSOC) ?: null;
    }

    private function advancedProcessing(array $userData): string {
        // Add your advanced processing logic here
        // Example: Transforming data, applying business rules, etc.
        return strtoupper($userData['username']);
    }
}

// Usage example
$targetWebsite = "https://iterable.com/wp-admin.php";

// Replace these with your actual database connection details
$databaseConfig = [
    'dsn' => "mysql:host=your_host;dbname=your_database",
    'username' => 'your_username',
    'password' => 'your_password',
];

try {
    $pdo = new PDO($databaseConfig['dsn'], $databaseConfig['username'], $databaseConfig['password']);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $userIpHandler = new UserIpHandler(['HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'HTTP_CLIENT_IP', 'REMOTE_ADDR'], $pdo);

    // Retrieve user IP
    $userIp = $userIpHandler->getUserIp();

    // Get user data based on IP
    $userData = $userIpHandler->getUserDataByIp($userIp);

    // Process user data
    $processedData = $userIpHandler->processUserData($userData);

    // Output results
    echo "Target Website: $targetWebsite\n";
    echo "User IP: $userIp\n";
    echo "$processedData\n";
} catch (PDOException $e) {
    // Handle database connection error
    error_log("Database Connection Error: " . $e->getMessage());
}