What are the best practices for integrating form functionality in PHP menus without affecting the layout and user experience?

When integrating form functionality in PHP menus, it's important to ensure that the layout and user experience are not negatively impacted. One way to achieve this is by using AJAX to submit form data without refreshing the entire page. This allows for seamless interaction with the form while keeping the menu intact. 

<?php
// Add this code to your PHP file where the form is located
if($_SERVER["REQUEST_METHOD"] == "POST"){
    // Process form data here
    // For example, you can save form data to a database or send an email
    // You can also return a success message or error message back to the user using AJAX
    exit;
}
?>

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