What are the best practices for handling user authentication in PHP forms?

When handling user authentication in PHP forms, it is important to securely hash passwords before storing them in the database, validate user input to prevent SQL injection attacks, and use prepared statements to prevent against SQL injection attacks. Additionally, always use HTTPS to encrypt data transmitted between the client and server to ensure secure communication. 

// Example of securely hashing passwords before storing them in the database
$password = $_POST['password'];
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

// Example of validating user input to prevent SQL injection attacks
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);

// Example of using prepared statements to prevent SQL injection attacks
$stmt = $conn->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();
$result = $stmt->get_result();

Keywords

password hashing session management CSRF protection input validation secure cookie handling

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