What best practices should be followed when handling user input and passwords in PHP scripts?

When handling user input and passwords in PHP scripts, it is essential to sanitize and validate user input to prevent SQL injection and other security vulnerabilities. Passwords should be securely hashed using a strong hashing algorithm like bcrypt before storing them in the database. Additionally, always use prepared statements when interacting with a database to prevent SQL injection attacks. 

// Sanitize and validate user input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Hash the password before storing it in the database
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);

// Use prepared statements when interacting with the database
$stmt = $pdo->prepare("INSERT INTO users (username, email, password) VALUES (?, ?, ?)");
$stmt->execute([$username, $email, $password]);

Keywords

validation sanitization password hashing prepared statements input filtering

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