What are the potential pitfalls of using PHP to handle form actions and redirects?

One potential pitfall of using PHP to handle form actions and redirects is the risk of user input manipulation leading to security vulnerabilities such as SQL injection or cross-site scripting. To prevent this, always sanitize and validate user input before processing it in the PHP script. Additionally, use prepared statements for database queries to prevent SQL injection attacks. 

// Example of sanitizing and validating user input
$name = isset($_POST['name']) ? htmlspecialchars($_POST['name']) : '';
$email = isset($_POST['email']) ? filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) : '';

// Example of using prepared statements for database queries
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection cross-site scripting header function form validation session hijacking

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