How can developers ensure data security and integrity when implementing an account system in PHP without using MySQL?

To ensure data security and integrity when implementing an account system in PHP without using MySQL, developers can use secure hashing algorithms like bcrypt to store passwords securely and prevent unauthorized access. Additionally, input validation and sanitization should be implemented to prevent SQL injection attacks. Finally, using session management techniques like CSRF tokens can help protect against cross-site request forgery attacks.

// Example of using bcrypt for password hashing
$password = "secretPassword123";
$hashedPassword = password_hash($password, PASSWORD_BCRYPT);

// Example of input validation and sanitization
$username = $_POST['username'];
if (!preg_match("/^[a-zA-Z0-9]{5,20}$/", $username)) {
    // handle invalid input
}

// Example of generating and validating CSRF tokens
$token = bin2hex(random_bytes(32));
$_SESSION['csrf_token'] = $token;

if ($_POST['csrf_token'] !== $_SESSION['csrf_token']) {
    // handle CSRF attack
}