What steps should be taken to enhance the security of a PHP-based ticketing system, especially when handling user input and sensitive data?

To enhance the security of a PHP-based ticketing system, especially when handling user input and sensitive data, steps such as input validation, data sanitization, and using prepared statements for database queries should be taken. 

// Example of input validation and data sanitization
$user_input = $_POST['user_input'];
$clean_input = htmlspecialchars(strip_tags(trim($user_input));

// Example of using prepared statements for database queries
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $clean_input);
$stmt->execute();

Keywords

SQL injection Cross-site scripting Data encryption Input validation Secure session management

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