How can JavaScript be utilized to dynamically populate dropdown menus in PHP based on user input?

To dynamically populate dropdown menus in PHP based on user input, JavaScript can be used to make AJAX requests to the server and update the dropdown options based on the response. This allows for a seamless user experience without needing to reload the page. 

<?php
// PHP code to handle AJAX request and return dropdown options

if(isset($_POST['user_input'])) {
    $user_input = $_POST['user_input'];

    // Perform database query or any other logic to get dropdown options based on user input
    $dropdown_options = array('Option 1', 'Option 2', 'Option 3');

    // Return dropdown options as JSON response
    echo json_encode($dropdown_options);
    exit;
}
?>

Keywords

JavaScript dropdown menus user input dynamic population PHP

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