What security measures should be implemented when allowing administrators to modify user data in a PHP form?

When allowing administrators to modify user data in a PHP form, it is crucial to implement proper security measures to prevent unauthorized access or malicious actions. This can be achieved by validating the administrator's credentials, using prepared statements to prevent SQL injection attacks, and implementing input validation to sanitize user input. 

// Check if the user is an administrator
if($_SESSION['role'] !== 'admin'){
    // Redirect to a different page or show an error message
    header("Location: unauthorized.php");
    exit();
}

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("UPDATE users SET username = :username, email = :email WHERE id = :id");
$stmt->bindParam(':username', $_POST['username']);
$stmt->bindParam(':email', $_POST['email']);
$stmt->bindParam(':id', $_POST['id']);
$stmt->execute();

// Sanitize user input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
$id = filter_var($_POST['id'], FILTER_SANITIZE_NUMBER_INT);

Keywords

SQL injection input validation prepared statements CSRF protection password hashing

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