How can PHP be used to create a responsive and user-friendly multi-step form like the one on expertsuisse.ch?

To create a responsive and user-friendly multi-step form like the one on expertsuisse.ch, you can use PHP along with HTML, CSS, and JavaScript. PHP can be used to handle form submissions, validate input, and store data in a database. Additionally, PHP can be used to dynamically generate form fields based on user input and guide users through each step of the form.

<?php
// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data
    // Validate input
    // Store data in database
    // Redirect to next step or thank you page
}
?>