What security measures should be taken when creating a login/register system in PHP?

When creating a login/register system in PHP, it is important to implement security measures to protect user data. Some key measures include using prepared statements to prevent SQL injection attacks, hashing passwords before storing them in the database, and implementing CSRF tokens to prevent cross-site request forgery. 

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();

// Hash passwords before storing them in the database
$password = password_hash($password, PASSWORD_DEFAULT);

// Implement CSRF tokens to prevent cross-site request forgery
$token = bin2hex(random_bytes(32));
$_SESSION['csrf_token'] = $token;

Keywords

SQL injection password hashing CSRF protection secure sessions input validation

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