What are some common methods for transferring data between different steps of a registration process in PHP?

When transferring data between different steps of a registration process in PHP, common methods include using sessions, hidden form fields, or storing data in a database temporarily. Sessions can store data across multiple pages for a particular user, hidden form fields can pass data between form submissions, and storing data in a database can allow for retrieval between steps.

// Using sessions to transfer data between registration steps
session_start();

// Step 1: Collect user input
$_SESSION['username'] = $_POST['username'];
$_SESSION['email'] = $_POST['email'];

// Step 2: Retrieve user input
$username = $_SESSION['username'];
$email = $_SESSION['email'];