How can PHP developers ensure secure transmission and handling of sensitive user data in messenger and guestbook features?

To ensure secure transmission and handling of sensitive user data in messenger and guestbook features, PHP developers should use HTTPS to encrypt data in transit, sanitize and validate input to prevent SQL injection and XSS attacks, and securely store sensitive data in a database using hashing and salting techniques. 

// Enable HTTPS to encrypt data in transit
if ($_SERVER['HTTPS'] != 'on') {
    header("Location: https://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    exit();
}

// Sanitize and validate user input to prevent SQL injection and XSS attacks
$username = htmlspecialchars($_POST['username']);
$message = htmlspecialchars($_POST['message']);

// Securely store sensitive data in a database using hashing and salting
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);

Keywords

SSL encryption input validation prepared statements password hashing

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