How can PHP developers ensure data security when handling form inputs?

PHP developers can ensure data security when handling form inputs by implementing input validation and sanitization. This involves checking the data against expected formats and removing any potentially harmful characters. Additionally, developers should use prepared statements or parameterized queries when interacting with databases to prevent SQL injection attacks. 

// Input validation and sanitization
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection input validation prepared statements cross-site scripting data encryption

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