What are the recommended practices for improving the user experience of a PHP contact form, such as providing immediate feedback on successful submission?

Issue: Providing immediate feedback on successful submission of a PHP contact form can greatly enhance the user experience by confirming to the user that their message has been successfully sent. Solution: To provide immediate feedback on successful submission, you can display a success message to the user after the form is submitted. This can be achieved by adding a conditional statement in the PHP code that checks if the form has been successfully submitted, and then displaying a success message accordingly.

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process the form submission
    // Your form processing code here

    // Check if the form was successfully submitted
    if (/* Add your condition here */) {
        echo "<p>Your message has been successfully sent!</p>";
    }
}
?>