What are some best practices for passing user-entered values between PHP forms?

When passing user-entered values between PHP forms, it is important to sanitize and validate the data to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. One common approach is to use PHP sessions to store the user-entered values temporarily and retrieve them on subsequent forms. Another method is to pass the values through hidden form fields or URL parameters.

// Form 1 - Get user input and store in session
session_start();
$_SESSION['user_input'] = $_POST['user_input'];

// Form 2 - Retrieve user input from session
session_start();
$user_input = $_SESSION['user_input'];