PDO 및 비밀번호 해싱을 사용하여 PHP 애플리케이션의 사용자 비밀번호를 어떻게 보호할 수 있습니까?

// Generate a secure hash of the password using password_hash()
$hash = password_hash($password, PASSWORD_DEFAULT);

// Prepare and execute SQL statement with the hashed password
$stmt = $dbh->prepare("INSERT INTO users SET username=?, email=?, password=?");
$stmt->execute([$username, $email, $hash]);

// Use PDO prepared statement to prevent SQL injection attacks
$sql = "SELECT * FROM users WHERE username = ?";
$stmt = $dbh->prepare($sql);
$stmt->execute([$_POST['username']]);

// Retrieve user record and verify password hash using password_verify()
$user = $stmt->fetchObject();
if ($user) {
    if (password_verify($_POST['password'], $user->password)) {
        // Valid login
        // ...
    } else {
        // Invalid password
        // ...
    }
} else {
    // Invalid username
    // ...
}