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<?php
// DB configuration
$host = 'localhost';
$db   = 'your_database';
$user = 'your_username';
$pass = 'your_password';
$charset = 'utf8mb4';

// DSN (Data Source Name)
$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$options = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];

try {
    $pdo = new PDO($dsn, $user, $pass, $options);
} catch (PDOException $e) {
    throw new PDOException($e->getMessage(), (int)$e->getCode());
}

// Define a class
class FileManager {
    public function readFile($filename) {
        return file_get_contents($filename);
    }

    public function writeFile($filename, $content) {
        file_put_contents($filename, $content);
    }
}

// Create an instance of the class
$fileManager = new FileManager();

// Process form data and interact with DB and file
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Assuming form fields are 'username' and 'content'
    $username = $_POST['username'];
    $content = $_POST['content'];

    // Write content to a file
    $fileManager->writeFile("user_data.txt", $content);

    // Insert data into database
    $stmt = $pdo->prepare('INSERT INTO users (username, content) VALUES (?, ?)');
    $stmt->execute([$username, $content]);

    echo "Data saved successfully!";
}

?>